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Question 1125105: Please help me Thank you in advance
A major credit card company has determined that the amount its customers charge on their accounts is normally distributed with an average of R2800 per month and a standard deviation of R200.
2.1) What proportion of customers charge more than R2750 per month on their account (rounded off to three decimals)? [3]
2.2) What percentage of customers charge between R2410 and R3016 per month on their account (rounded off to two decimals)? [5]
2.3) If the company has 20, 000 customers, how many customers charge less than R2430 per month on their account (rounded off to zero decimals)? [2]

Click here to see answer by Theo(13342)

Question 1125147: A telemarketer calls people and tries to sell them a subscription to a daily newspaper. On 16% of her calls, there is no answer or the line is busy. She sells subscriptions to 9% of the remaining calls. For what proportion of calls does she make a sale?
Click here to see answer by josmiceli(19441)

Question 1125218: three missiles A B and C are fired the probability that A hits the target 0.5 ,B hits the target is 0.7 and C hits the target 0.4 what is the probability the atleast one will not hit the target.
Click here to see answer by ikleyn(52750)

Question 1125237: I got the answer for part a but cannot figure out part b. Thanks.
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 140 lb and 191 lb. The new population of pilots has normally distributed weights with a mean of 150 lb and a standard deviation of 30.4 lb.
a. If a pilot is randomly selected, find the probability that his weight is between 140 lb and 191 lb.
The probability is approximately
0.5402
0.5402. (Round to four decimal places as needed.)
b. If 35 different pilots are randomly selected, find the probability that their mean weight is between 140 lb and 191 lb.
The probability is approximately
nothing. (Round to four decimal places as needed.)
Click here to see answer by Boreal(15235)

Question 1125223: The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.25, and the sample statistics include nequals1366 subjects with 314 saying that they smoked a cigarette in the past week. Find the value of the test statistic.
The test statistic is?
(Round to two decimal places as needed.)
Click here to see answer by Boreal(15235)

Question 1125245: An elevator has a placard stating that the maximum capacity is 2370 lb/15 passengers. So, 15 adult male passengers can have a mean weight of up to 2370 divided by 15 equals 158 pounds. If the elevator is loaded with 15 adult male passengers, find the probability that it is overloaded because they have a mean weight greater than 158 lb. (Assume that weights of males are normally distributed with a mean of 162 lb and a standard deviation of 28 lb.) Does this elevator appear to be safe?
Click here to see answer by Boreal(15235)

Question 1125257: There are seven women and nine men on a committee. A subcommittee of three people is selected at random. What is the probability that all three all three people selected are men given that all three all three are the same gender?

Click here to see answer by ikleyn(52750)

Question 1125318: A pair of dice is rolled. list the element of the sample space S. let A denote the event "the sum is less than 5" and B the event that "a 6 occurs on either die". list the element of corresponding to event A and to event B.
Click here to see answer by ikleyn(52750)

Question 1125224: Assume that the significance level is alpha equals 0.1. Use the given statement and find the P-value and critical value(s).
The test statistic of zequalsnegative 1.17 is obtained when testing the claim that p equals one fifth
.
Click here to view page 1 of the Normal table. LOADING... Click here to view page 2 of the Normal table. LOADING...
P-valueequals
(Round to four decimal places as needed.)
The critical value(s) is/are
nothing.
(Round to two decimal places as needed. Use a comma to separate answers as needed.)
Click here to see answer by ikleyn(52750)

Question 1125331: Nine percent of men and 0.25% of women cannot distinguish between the colors red and green. This is the type of color blindness that causes problems with traffic signals.
(a) If 9 men are randomly selected for a study of traffic signal perceptions, find the probability that between 1 and 3 inclusive of them have this type of color blindness.
Click here to see answer by Boreal(15235)

Question 1125343: You need to have a password with 4 letters followed by 2 even digits between 0 and 9, inclusive. If the characters and digits cannot be used more than once, how many choices do you have for your password?
Click here to see answer by ikleyn(52750)

Question 1125388: 1) A retail outlet wanted to know whether its weekly advertisement in the daily newspaper works. To acquire this critical information, the store manager surveyed the people who enter the store and determined whether each individual saw the ad and whether a purchase was made. From the information developed, the manager produced the following table of joint probabilities.

Purchase Status
Purchase No Purchase Total
See the ads 0.22 0.33 0.55
Do not see ads 0.09 0.36 0.45
Total 0.31 0.69 1.00
What is the probability that the customer purchase?
What is the probability that the customer purchase if he sees the ads?
Are the events of �See the Ads� and �Purchase� independent? Show why or why not.
Are the ads effective? Explain

Thanks alot
Click here to see answer by jim_thompson5910(35256)

Question 1125291: The following data is associated with the problem:
Year Population (in millions)
1950 6.79
1960 27.81
1970 45.59
1980 69.01
1990 84.39
2000 110.21
A: use x=0 for 1950, x=10 for 1960,....
The linear regression equation that best fits this data in the form y=ax+b is: ______________. Round the constants to the nearest thousandth.
B: Use your regression equation to predict the population if x=5.15
c: Approximate in what year the population reaches 38.05 million.
Click here to see answer by MathLover1(20849)

Question 1125438: The probability that a patient recovers from a delicate heart operation is 90%. What is the probability that exactly five of the next 7 patients having this operation survive?
Click here to see answer by ikleyn(52750)

Question 1125479: A coin is tossed, and a die is rolled. Find the sample space
Click here to see answer by ikleyn(52750)

Question 1125508: The names of four students are placed in a small box and two will be selected. Let 1, 2, 3 and 4 denote the students. What is the probability that:
a) 3 is selected?
b) 3 or 4 is selected?
c) 3 is not selected?
Click here to see answer by ikleyn(52750)

Question 1125526: The probability that a person gets selected in the Police Academy is 0.32. What is the probability
that out of 5 randomly selected people, at most 2 persons are selected? Draw a tree diagram for
this problem.
Click here to see answer by ikleyn(52750)

Question 1125355: How would I compute this problem by hand; what is the formula?
A stationary store has decided to accept a large shipment of ball-point pens if an inspection of 17 randomly selected pens yields no more than two defective pens.
(a) Find the probability that this shipment is accepted if 5% of the total shipment is defective. (Use 3 decimal
places.)
(b) Find the probability that this shipment is not accepted if 15% of the total shipment is defective. (Use 3 decimal
places.)
Click here to see answer by Theo(13342)

Question 1125563: Alice and Bill are planning to have three children. (Assume that it is equally likely for a boy or a girl to be born.)
What is the probability that at least one will be a girl?
Click here to see answer by Theo(13342)

Question 1125562: Alice and Bill are planning to have three children. (Assume that it is equally likely for a boy or a girl to be born.)
What is the probability that all three of their children will be girls?
Click here to see answer by Alan3354(69443)

Question 1125581: Let E and F be two events in S with P(E) = 0.42, P(F) = 0.52, and P(E ∪ F) = 0.7. Find P(E ∩ F) and P(E ∩ FC).
P(E ∩ F) =
P(E ∩ F^C) =
Click here to see answer by Edwin McCravy(20054)

Question 1125601: Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. The mean arrival rate is passengers per minute.

Click here to see answer by ikleyn(52750)

Question 1125595: A survey of athletes at a high school is conducted, and the following facts are discovered: 26% of the athletes are football players, 29% are basketball players, and 8% of the athletes play both football and basketball. An athlete is chosen at random from the high school: what is the probability that the athlete is either a football player or a basketball player?
Click here to see answer by ikleyn(52750)

Question 1125661: A hacker is trying to guess someone's password. The hacker knows (somehow) that the password is 3 digits long, and that each digit could be a number between 0 and 5. Assume that the hacker makes random guesses. What is the probability that the hacker guesses the password on her first try? Round to six decimal places.

Click here to see answer by ikleyn(52750)

Question 1125664: Out of 7 children, in how many ways can a family have at least 1 boy?
How many ways can be made?
Click here to see answer by math_helper(2461)

Question 1125664: Out of 7 children, in how many ways can a family have at least 1 boy?
How many ways can be made?
Click here to see answer by KMST(5328)

Question 1125681: Let S = {a, b, c, d, e, f} with P(b) = 0.26, P(c) = 0.14, P(d) = 0.17, P(e) = 0.15, and P(f) = 0.14. Let E = {a, c, f} and F = {b, d, e, f}. Find P(a), P(E), and P(F).

P(a) =

P(E) =

P(F) =
Click here to see answer by solver91311(24713)

Question 1125675: An exam produced grades with a mean of 70 and a standard deviation of 11.3. Find the Z score for the following values. Round all answers to two decimal places. All work must be shown for credit on answers.
1) X= 54
2) X= 77
3) X= 86
4) X= 93
Click here to see answer by solver91311(24713)

Question 1125693: Students log on to the California Virtual Campus with a user name consisting of 8 characters: 4 uppercase letters of the alphabet followed by 4 digits. How many user names begin with A and end with 9?
Click here to see answer by Boreal(15235)

Question 1125679: A door-to-door salesman expects to make a sale 25% of the time when starting the day. But making a sale increases his enthusiasm so much that the probability of a sale to the next customer is 0.46. If he makes no sale, the probability for a sale to the next customer stays at 0.25. What is the probability that he will make at least two sales with his first three visits?
Click here to see answer by Boreal(15235)

Question 1125677: A Z score is a standardized score that indicates how many ______________ an X value is away from it's mean.
Click here to see answer by Boreal(15235)

Question 1125662: 58% of all the town's residents own a dog and 62% own a cat. Of the dog owners 45% also own a cat. If a town resident is chosen at random find: (round to 4 decimal places where possible)
a. P(Own a Dog) =
b. P(Own a Cat) =
c. P(Own a Cat and a Dog) =
d. P(Own a Dog GIVEN Own a Cat) =
Click here to see answer by ikleyn(52750)

Question 1125663: A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than four percentage points question mark Complete parts (a) through (c) below.
Click here to see answer by Boreal(15235)

Question 1125536: If the probability of getting caught copying someone else�s assignment is 20%, find the
probability of not getting caught in 3 attempts. (Assume Independence).
Click here to see answer by Boreal(15235)

Question 1125561: the personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. from the past records, they have found that the length of a first interview is normally distributed, with a mean = 34 minutes and a standard deviation = 7 minutes. (round your answers to four decimal places.)
a-what is the probability that a first interview will last 40 minutes or longer?
b-two first interviews are usually scheduled per day. what is the probability that the average length of the two interviews will be 40 minutes or longer?
Click here to see answer by Boreal(15235)

Question 1125726: If a "word" is any arrangement of 3 different letters, how many 3-letter "words" can be formed from the letters B, O, N, and K, where each letter is to be used once?
how many words?
Click here to see answer by ikleyn(52750)

Question 1125711: A _______ is a distribution that has no specific beginning or ending value.
Click here to see answer by MathLover1(20849)

Question 1125708: Find the Interquartile rage (IQR) for the following data set:
6, 7, 12, 13, 14, 18, 20, 48

Click here to see answer by MathLover1(20849)

Question 1125790: A fair coin is flipped four times. What is the probability that tails occurs exactly 3 times if it is known that tails occurs at least three times?
Click here to see answer by Alan3354(69443)

Question 1125803: A sample of two different calculators is randomly selected from a group containing 46 that are defective and 26 that have no defects. What is the probability that are all four of the calculators selected are defective? Round to four decimal places.
A) 0.1666
B) 10.9154
C) 0.1586
D) 0.1021
Click here to see answer by Boreal(15235)

Question 1125802: If a committee of 4 is to be chosen at random from a class of 11 students, what is the probability of any particular committee being selected? (Enter your answer as a reduced fraction.)

Click here to see answer by Boreal(15235)

Question 1125792: Let P(E) = 0.35, P(F) = 0.3, and P(E ∩ F) = 0.15. Draw a Venn diagram and find the conditional probabilities.

(a) P(F | E ∩ F)

(b) P(EC | E )
Click here to see answer by ikleyn(52750)

Question 1125829: 1. [4 pts] The average weight of 6 people in an elevator is 173 pounds. A 7th
person gets on and now the average weight is 165 pounds. How much
did the 7th person weigh?
Click here to see answer by greenestamps(13195)

Question 1125820: Suppose that you are offered the following "deal." You roll a six sided die. If you roll a 6, you win $6. If you roll a 4 or 5, you win $3. Otherwise, you pay $5.
a. Complete the PDF Table. List the X values, where X is the profit, from smallest to largest. Round to 4 decimal places where appropriate.
Probability Distribution Table
X P(X)
b. Find the expected profit. $
(Round to the nearest cent)
Click here to see answer by kasperk(4)

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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