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Question 1168147: An analysis of the backgrounds of 404 men known to be active in terrorist organizations reported that 78 of these men had engineering degrees. In the population of men with the potential to be active in terrorist organizations, the proportion with engineering degrees is 3.5%.
Does the data provide evidence that engineers are significantly over-represented in terrorist organizations? Use a 5% significance level.

Click here to see answer by Boreal(15235) About Me 

Question 1168145: A survey of a group's web habits for the past month obtained the following information.
36% visited Facebook.
34% visited LinkedIn.
31% visited Google.
19% visited Facebook and LinkedIn.
16% visited Facebook and Google.
16% visited LinkedIn and Google.
9% visited all three sites.
Find the percentage that visited none of these three sites last month.

Click here to see answer by ikleyn(52776) About Me 

Question 1168146: An urn contains 7 blue, 7 yellow, and 8 gray marbles. Two marbles are randomly drawn from the urn.
Find the probability the two marbles are the same color.

Click here to see answer by VFBundy(438) About Me 
Question 1168146: An urn contains 7 blue, 7 yellow, and 8 gray marbles. Two marbles are randomly drawn from the urn.
Find the probability the two marbles are the same color.

Click here to see answer by Boreal(15235) About Me 

Question 1168138: According to the Empirical rule, what percent of the data should be between 174 and 846 for a population with mean of 510 and standard deviation of 168?
Click here to see answer by Boreal(15235) About Me 

Question 1168121: The time it takes Jessica to bicycle to school is normally distributed, with a mean time of 15 minutes and a variance of 4 minutes. Jessica has to be at school at 8:00am. What time should she leave her house so she will be late only 4% of the time?
Click here to see answer by VFBundy(438) About Me 
Question 1168121: The time it takes Jessica to bicycle to school is normally distributed, with a mean time of 15 minutes and a variance of 4 minutes. Jessica has to be at school at 8:00am. What time should she leave her house so she will be late only 4% of the time?
Click here to see answer by Theo(13342) About Me 

Question 1168171: In how many ways can a doubles game of tennis be arranged from seven boys and five girls if each side must have one boy and one girl?
Click here to see answer by ikleyn(52776) About Me 
Question 1168171: In how many ways can a doubles game of tennis be arranged from seven boys and five girls if each side must have one boy and one girl?
Click here to see answer by greenestamps(13198) About Me 

Question 1168116: An applicant must score at least 80 points on a particular psychological test to be eligible to join Canadian University services overseas. From several years of experience, it is known that 60% of the applicants meet the requirement. Let the random variable x be the number of applicants who meet this requirement out of a (randomly selected) group of 25 applicants.
a)find the mean of x
b) Find the standard deviation of x
c) using the Empirical Rule, within what limit would you expect most (say, 95%) of the measurements to be?

Click here to see answer by Boreal(15235) About Me 

Question 1168114: ​Women's heights average 68 inches with a standard deviation of 2.5 inches in a certain study. Use the​ 68-95-99.7 rule to determine the typical ranges of the​ women's heights. In what range will approximately the middle 95​% of the​ women's heights​ lie?
Click here to see answer by Boreal(15235) About Me 

Question 1168182: Anil received the following marks on his first five biology tests: 75, 84, 92, 61, and 79. What test score must Anil earn on his sixth test so that his mean mark for all six tests will be 80?
Click here to see answer by josgarithmetic(39616) About Me 

Question 1168184: For a statistics assignment, a student observed the cars entering the school staff parking lot during a 1-hour period. The results are shown:
40 cars had only a driver
28 cars had the driver and one passenger
10 cars had the driver and two passengers
2 cars had the driver and three passengers
a) Compute the mean, median, and mode number of people per car.
b) The student presented her statistics to the staff. Write a sentence that is appropriate to use for each measure of central tendency.

Click here to see answer by Boreal(15235) About Me 

Question 1168268: If a permutation is chosen at random, what is the probability that it begins with at least 2 A's? AAABBBCCC
Click here to see answer by greenestamps(13198) About Me 

Question 1168278: A test for a disease that affects 2% of the population, has been discovered. In clinical trials, the test was found to have the following error rates:
i. 8% of the people free of the disease had a positive reaction (“false alarm”).

Click here to see answer by ikleyn(52776) About Me 

Question 1168286: In New York State, the mean salary for high school teachers in 2017 was $98,210 with a standard deviation of $9,560. Only Alaska’s mean salary was higher! Assume New York’s state salaries follow a normal distribution.
a. What percent of New York’s state high school teachers earn between $84,000 and $89,000? (Round intermediate calculations to 2 decimal places and final answer to 2 decimal places.)


b. What percent of New York’s state high school teachers earn between $89,000 and $104,000? (Round intermediate calculations to 2 decimal places and final answer to 2 decimal places.)


c. What percent of New York’s state high school teachers earn less than $74,000? (Round intermediate calculations to 2 decimal places and final answer to 2 decimal places.)

Click here to see answer by Theo(13342) About Me 

Question 1168333: How many license plates are possible if each plate must have three letters followed by three digits and repeats are not allowed?
Click here to see answer by dkppathak(439) About Me 

Question 1168328: The losings teams in all college basketball games for 2011 had scores that are approximately normally distributed with mean 64 points and standard deviation about 11.7 points. Based on the Normal model, we'd expect that the middle 90% of losing teams' scores would be between about
Click here to see answer by Boreal(15235) About Me 

Question 1168350: The probability of a Hat being red is 1/4.
The probability of a Hat being green is 1/4
The probability of a Hat being white is 1/2
The probability of a Hat being red or white is __

Click here to see answer by Edwin McCravy(20054) About Me 

Question 1168330: A fair coin is flipped 12 times. Find the probability that more than 8 of the flips turn up tails.
Click here to see answer by Boreal(15235) About Me 

Question 1168393: The time it takes Jessica to bicycle to school is normally distributed with a mean time of 15 minutes and variance of 4 minutes. Jessica has to be at school at 8 am what time should she leaves her house so she will be late only 4% of the time ?
Click here to see answer by Boreal(15235) About Me 

Question 1168391: Suppose 40% of TV sets use in Canada on particolare night into 7 game of stably cup playoffs
A) if we were take a sample of six in use tv , what is probability exactly three are tuned to stably cup playoffs ?
B) if instead the sample consisted of 10 in use tv
What is probability 4 or more are turned to stably cup playoffs
What is the probability that almost 7 of them are tuned to stably cup playoffs
C) if instead sample consider of 100 I uses tv what is probability that atleast 55 of them are tuned to stably cup playoffs ?

Click here to see answer by Boreal(15235) About Me 

Question 1168399: Three friends took a short hike uphill at a steady pace of 1.5 mph and then downhill at a rate of 4 mph. If the time to climb the hill took an hour more than the time to hike down the hill, how long was the entire hike?

Click here to see answer by Boreal(15235) About Me 

Question 1168366: The probability of a resident of a certain city being the victim of a serious crime at some point in his or her life is approximately .25 What are the odds in favor of a resident of this city never being the victim of a serious crime during his or her lifetime?
Click here to see answer by ikleyn(52776) About Me 

Question 1168327: 8C4/12C4 perform the indicated calculationn
Click here to see answer by Theo(13342) About Me 

Question 1168417: the following data was collected for a two-factor anova with three treatments and three blocks Treatment Block 1 2 3 A 12 14 8 B 9 11 9 C 7 8 8
Click here to see answer by ikleyn(52776) About Me 

Question 1168427: Two cards are drawn from a well-shuffled deck of 52 cards without replacement. Determine the probability of each event.
a) The second card is spade.

Click here to see answer by solver91311(24713) About Me 

Question 1168471: A credit card company offers an annual 2% cash-back rebate on all gasoline purchases. If a family spent $6700 on gasoline purchases over the course of a year, what was the family's rebate at the end of the year?
Click here to see answer by Alan3354(69443) About Me 

Question 1168478: A pizza restaurant offers six different toppings. If you can order any number of toppings, how many different pizzas are possible?
Click here to see answer by ikleyn(52776) About Me 

Question 1168477: 1. Yolanda has seven CDs that she is going to give away. She lets her best friend choose two of the seven CDs. How many different groups of two CDs are possible?
Click here to see answer by ikleyn(52776) About Me 

Question 1168470: In a recent year, wind machines in a country generated 189.6 billion kWh of electricity, enough to serve over 15 million households. The nation's total electricity production that year was 4,096 billion kWh. What percent of the total energy production was generated by wind machines? Round to the nearest tenth of a percent.
Click here to see answer by ikleyn(52776) About Me 

Question 1168469: Auto sales in a country increased from 15.8 million in 2014 to 16.8 million in
2015. Find the percent increase in auto sales from 2014 to 2015. Round to the
nearest tenth of a percent.

Click here to see answer by Edwin McCravy(20054) About Me 

Question 1168487: The chartered financial analyst (CFA) is a designation earned after taking three annual exams (CFA I,II, and III). The exams are taken in early June. Candidates who pass an exam are eligible to take the exam for the next level in the following year. The pass rates for levels I, II, and III are 0.53, 0.78, and 0.85, respectively. Suppose that 3,000 candidates take the level I exam, 2,500 take the level II exam and 2,000 take the level III exam. A randomly selected candidate who took a CFA exam tells you that he has passed the exam. What is the probability that he took the CFA I exam?
Click here to see answer by ikleyn(52776) About Me 

Question 1168497: Suppose that an experiment consists of tossing a coin nine times and observing the sequence of heads and tails. How many different outcomes are possible?
Click here to see answer by ikleyn(52776) About Me 

Question 1168500: Suppose ACT Reading scores are normally distributed with a mean of 21.4 and a standard deviation of 5.9. A university plans to award scholarships to students whose scores are in the top 9%. What is the minimum score required for the scholarship? Round your answer to the nearest tenth, if necessary.

Click here to see answer by Boreal(15235) About Me 

Question 1168483: You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.75. With water it will die with probability 0.5. You are 88 % certain the neighbor will remember to water the plant.
a)When you are on vacation, find the probability that the plant will die.
b)You come back from the vacation and the plant is dead. What is the probability the neighbor forgot to water it?

Click here to see answer by ikleyn(52776) About Me 

Question 1168491: Trees planted by a landscaping firm have a 95% one-year survival rate, If they plant 15 trees in a park, what is the following probabilities:
1. All the trees survive one year.
2. At least 13 trees survive one year.

Click here to see answer by Boreal(15235) About Me 

Question 1168484: A new medical test has been designed to detect the presence of the mysterious Brainlesserian disease. Among those who have the disease, the probability that the disease will be detected by the new test is 0.82. However, the probability that the test will erroneously indicate the presence of the disease in those who do not actually have it is 0.1. It is estimated that 20 % of the population who take this test have the disease.
If the test administered to an individual is positive, what is the probability that the person actually has the disease?

Click here to see answer by Boreal(15235) About Me 

Question 1168474: In a random sample of 28 people, the mean commute time to work was 31.2 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 98% confidence interval for the population mean μ. What is the margin of error of μ? Interpret the results.
-The confidence interval for the population mean μ is ( , )?
-The margin of error of μ is ( )?
-Interpret the resluts.
A. with 98% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval.
B. With 98% confidence, it can be said that the commute time is between the bounds of the confidence interval.
C. If a large sample of people are taken approximately 98% of them will have commute times between the bounds of the confidence interval.
D. It can be said that 98% of people have a commute time between the bounds of the confidence interval.

Click here to see answer by Boreal(15235) About Me 

Question 1168507: Two cards are drawn from a well-shuffled deck of 52 cards without replacement. Determine the probability of each event.
b) First card is a face card and the second card is a diamond.

Click here to see answer by Alan3354(69443) About Me 

Question 1168482: Bad gums may mean a bad heart. Researchers discovered that 81% of people who have suffered a heart attack had periodontal disease, an inflammation of the gums. Only 28% of healthy people have this disease. Suppose that in a certain community heart attacks are quite rare, occurring with only 14% probability.
A. If someone has periodontal disease, what is the probability that he or she will have a heart attack?
B. If 43% of the people in a community will have a heart attack, what is the probability that a person with periodontal disease will have a heart attack?

Click here to see answer by ikleyn(52776) About Me 

Question 1168512: A card drawn from a standard deck. find the probability of drawing a club or a 10?

Click here to see answer by math_helper(2461) About Me 

Question 1168510: A restaurant has seven different salad add ons. In how many different ways can you order a salad?
Click here to see answer by ikleyn(52776) About Me 

Question 1168514: Four marbles are drawn from a bag containing six green and five purple marbles.
What is the probability that all four marbles are purple?
i) if the marble is replaced after each draw?
ii) if the marbles are not replaced?

Click here to see answer by Boreal(15235) About Me 

Question 1168486: Factories A, B and C produce computers. Factory A produces 3 times as many computers as factory C, and factory B produces 5 times as many computers as factory C. The probability that a computer produced by factory A is defective is 0.033, the probability that a computer produced by factory B is defective is 0.03, and the probability that a computer produced by factory C is defective is 0.035.
A computer is selected at random and it is found to be defective. What is the probability it came from factory A?

Click here to see answer by ikleyn(52776) About Me 

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240, 30241..30285, 30286..30330, 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