Questions on Algebra: Probability and statistics answered by real tutors!

Tutors Answer Your Questions about Probability-and-statistics (FREE)

Question 644114: A bag contains "n"cards each having one of the numbers 1,2,3,4,.....n written on it. If all numbers are used the probability of drawing a card with a number less than or equal to 10 is 4/10. How many cards are in the bag?
Click here to see answer by stanbon(57387)

Question 644208: 1. a box contains 3 yellow, 2 blue,and 4 red pencils. suppose you choose a pencil, replace, then choose another, find the probability of choosing yellow then red?
2. refer to problem above , find the probability of choosing blue then yellow?
3. suppose you chose a pencil from the box problem above, and then choose another pencil without replacing the first one. find probability of choosing blue, then red?
4. refer question above, find the probabilityof choosing yellow then blue
Click here to see answer by edjones(7569)

Question 644312: 368,862 whats is the ten thousands, hundreds , and ones value
Click here to see answer by jim_thompson5910(28598)

Question 644287: The local painters union recieved an unusual and urgent request to paint 2 houses in 4 hours. If each painter can paint one house in 10 hours, how many painters will it take to accommodate this request?
Click here to see answer by ankor@dixie-net.com(15660)

Question 644379: What is the probability of getting a license plate that has a repeated letter or digit if you live in a state that has two numerals followed by five letters followed by one numeral?
Click here to see answer by jim_thompson5910(28598)

Question 644588: Evaluate the expression and express the result using the usual format for writing numbers (instead of scientific notation).
41C3
Click here to see answer by nerdybill(6962)

Question 644650: A set of 50 data values has a mean of 34 and a variance of 25.
I. Find the standard score (z) for a data value = 23.
II. Find the probability of a data value < 23.

Click here to see answer by stanbon(57387)

Question 644664: Trudy Green works for the True-Green Lawn Company. Her job is to solicit lawn-care business via the telephone. Listed beloware the number of appointments she made in each of the last 25 hours of calling.
9 5 2 6 5 6 44 7 2 3 6 3 44 7 8 4 4 5 54 8 33
what is the arithmetic mean number of appointments she made per hour? What is the median number of appointments per hour? Write a brief report summarizing the findings.
Click here to see answer by lynnlo(4164)

Question 644720: 25% failed math, 17.6% failed biology. 10.5% failed both
What is the probability that the student failed Math or Bio?
Click here to see answer by reviewermath(534)

Question 644782: Suppose a 10 item multiple choice test which has 5 choices for each questions was given passing grade of 10%. If a student who took the test did not study, what is the probability that student will pass if he guessed each and every question?

.THANKS!
Click here to see answer by colliefan(239)

Question 644838: Please Help I am trying...
The following data lists the average monthly snowfall for January in 15 cities around the US:

13 15 26 24 44 4 20 37
31 3 47 21 13 28 23

Find the mean, variance, and standard deviation. Please show all of your work.
I have ...
Mean - 13+31+15+3+26+47+24+21+44+13+4+28+20+23+37=349/15=
Mean=23.27
Variance -
Can anyone help please?
Click here to see answer by ewatrrr(10682)

Question 644843: 11. Assume that the population of heights of female college students is approximately normally distributed with mean m of 66.24 inches and standard deviation s of 5.07 inches. A random sample of 72 heights is obtained. Show all work. -
(A) Find P(x>65.75)
(B) Find the mean and standard error of the xbar distribution
(C) Find P(xbar>65.75).
(D) Why is the formula required to solve (A) different than (C)?

Click here to see answer by ewatrrr(10682)

Question 644841: My last one I need help with please
Starting with the data values 70 and 100, add three data values to the sample so that the mean is 85, the median is 76, and the mode is 76. Please show all of your work.

I have this ...
Since the mode is 76, at least 2 of the values must be 76.
Mean = (1/9)(70 + 76 + 76 + x + 100) = 85

Click here to see answer by ewatrrr(10682)

Question 644887: A traffic light is green for 50 seconds yellow for 10 seconds and red for 40 seconds A. P(green) in simplified fraction and decimal form

Click here to see answer by stanbon(57387)

Question 645460: Sal owns 20 blue socks and 20 brown socks. What is the minimum number of socks he must pull out of his drawer to ensure a matching pair?
Click here to see answer by Edwin McCravy(8909)

Question 645513: A bowl contains 5 red chips 7 blue chips 6 yellow chips and 20 green chips . One chip is randomly drawn. What is the probablity of selecting a blue chip
Click here to see answer by ewatrrr(10682)

Question 645631: if 400 songs are on an iPod and 150 of those songs are disco songs, how many songs must be played in random order to ensure that at least one disco song is played?
Click here to see answer by checkley79(3050)

Question 645749: if 99 is the product and 100 the sum, what are the factors?
Click here to see answer by MathLover1(6638)

Question 645727: suppose you go to a party with four americans and four canadians, none of whom you have met. how many people must you meet to be sure of meeting one canadin and one american?
Click here to see answer by stanbon(57387)

Question 645487: A mall has 3 department stores, JC Penny's, Macy's, and Sears. A survey of 2,631 people exiting the mall found that 432 made a purchase at JC Penny's, 291 made a purchase at Macy's, 517 made a purchase at Sears, 83 made a purchase at JC Penny's and Macy's, 207 made a purchase at JC Penny and Sears, 126 of them made a purchase at Macy's and Sears, and 45 of them made a purchase at all 3 stores.
A. How many people made a purchase at JC Penney but did not make a purchase at Sears?
B. How many people made a purchase at exactly one of the three stores?
Thanks so much.
Click here to see answer by stanbon(57387)

Question 645874: How many ways are there of choosing 4 m and ms out of a bag?
Click here to see answer by Alan3354(30993)

Question 387979: Information from the Department of Motor Vehicles
indicates that the average age of licensed drivers is
U= 39.7 years with a standard deviation of
O= 12.5 years. Assuming that the distribution of
drivers’ ages is approximately normal,
a. What proportion of licensed drivers are more than
50 years old?
b. What proportion of licensed drivers are less than
30 years old?

Click here to see answer by 555777(1)

Question 646007: b) which of the following is a valid probability value for a discrete random variable?
0.2
1.01
-0.7
All of the above

Click here to see answer by solver91311(16897)

Question 646103: A 7 card hand is dealt from a standard deck of 52 playing cards. What is the probability that:
A. you are dealt exactly 2 jacks?
B. You are dealt at most 3 diamonds?
Please help. thank you in advance.
Click here to see answer by ewatrrr(10682)

Question 646101: The weights of adult Asian palm civets are known to be normally distributed with
a mean of 7.7 pounds and a standard deviation of 0.95 pounds. What is the
probability that a randomly selected civet will:
A. Weigh at least 6 pounds?
B. Weigh less than 5 pounds or more than 10 pounds?
Please help, i'm so confused! thank you
Click here to see answer by ewatrrr(10682)

Question 646136: Based upon statistical studies it has been found that 0.19% of all births in the United States will result in triplets being born. If 29,700 births are selected at random what is the probability that:
A. At most 50 of them will result in triples being born?
B. Between 45-70 of them will result in triplets being born?
Please help, would be much appreciated
Click here to see answer by ewatrrr(10682)

Question 646174: According to the Internal Revenue Service, the mean tax for the year 2011
was $3,000. Assume the standard deviation is $410 and that the amounts follow
a normal probability distribution.
What percent of the refunds are less than $2,900 or greater than $3,200?
Click here to see answer by ewatrrr(10682)

Question 646294: Select and perform an operation to answer the question.
13. What is the sum of 25 and -8?
How do you figure out what the answer is?
Click here to see answer by stanbon(57387)

Question 646303: Given a binomial distribution with n = 36 and p = 0.87, would the normal distribution provide a reasonable approximation? Why or why not?
Click here to see answer by ewatrrr(10682)

Question 646121: During the 2002 soccer season, Maren Meinert of the Boston Breakers made approximately 2 goal points for every 5 of her shots on goal. What is the probability that Maren Meinert would make 2 goal points on two shots in a row during the 2002 season?
Click here to see answer by stanbon(57387)

Question 646351: Perform the given operation. Give the answer with the appropriate unit of measure.
21.) 4 1/2 feet + 5 1/3
How do you solve the problem?
Click here to see answer by stanbon(57387)

Question 646356: Evaluate the expression for the given value of x.
x-9 when x=8
How do you solve this problem?
Click here to see answer by stanbon(57387)

Question 645996: alvin community college's identification number consist of a letter followed by four digits.how many different identification numbers are possible if repetition is not permitted

Click here to see answer by stanbon(57387)

Question 646639: I have the numbers 8,8,4,9. I have to get the sum 24 by using the numbers only once. I was told you can multiply, divide, add, sub. To get it.
Click here to see answer by solver91311(16897)

Question 646685: Writing to Explain Suppose you pick three number cards: 5,7,8 You use te cards to make the greatest 3 digit number.What number is it? Write an explanation of how you found your answer.
Click here to see answer by MathLover1(6638)

Question 646721: the letters of the word "COMPUTER" are arranged randomly. find the probablity that all vowels occupy adjacent places.
Click here to see answer by ewatrrr(10682)

Question 646789: if you randomly select 3 cans of regular and diet cola, but assume that there are 8 cans of regular cola and 6 cans of diet cola.
(1) What is the probability that 3 cans of regular cola are selected?
(2) What is the probability that 0 cans of regular cola are selected, i.e.,
3 cans of diet cola are selected.?
(1) What is the probability that 2 cans of regular cola and 1 can of diet cola are selected?

Click here to see answer by ewatrrr(10682)

Question 646779: Rework problem 9 from section 2.3 of your text. Assume that you have 6 dimes and 5 quarters (all distinct), and you select 4 coins.
(1) In how many ways can the selection be made? 330
(2) In how many ways can the selection be made if all the coins are dimes? 15
(3) In how many ways can the selection be made if you select 2 dimes and 2 quarters? 150
(4) In how many ways can the selection be made so that at least 2 coins are dimes?
I'm confused on number four. I tied using 6c2+6c3+6c4 and multiplying the same set but none of the answers are right. I know the problem can be set up as total-less than two options but i dont know how to set up the permutiation or combination. I do understand how to visualize the problem though
Click here to see answer by ewatrrr(10682)

Question 646776: 7 cards are marked with a diferent number from 1-7, then placed face down on a table. One card is selected at random and not placed. A second card is then taken, at random . Determine the probabity that one card has an odd number on it.
This is the question I am unsure about. I found out that the probability for the first card that is picked up is 4/7 and for the second card the probability is 3/6 but I am not sure how to then use that info to get an answer to the writing above? Could you help?
Click here to see answer by ewatrrr(10682)

Question 646858: 5. How many phone numbers are possible in the 952 area code?

Click here to see answer by dfrazzetto(277)

Question 646847: the resting heart rates for 10 members of a school's soccer team were measured by the school nurse.the results were the following (beats per min) :
55,58,47,62,64,61,56,60,63,65
compute the sample mean and round to the nearest tenth if necessary
Click here to see answer by ewatrrr(10682)

Question 647251: In a population of adults, normal distribution with mean 112 and standard deviation of 21. whats the percentage of adults with an IQ greater than 154?
Click here to see answer by colliefan(239)

Question 647317: Set of six positive numbers that have a median of 8 and mean of 10
Click here to see answer by Edwin McCravy(8909)

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