# random

4,731 results, page 20
1. ## Statistics

In a department store there are 120 customers, 90 of whom will buy at least 1 item. If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item.

asked by Lori on September 20, 2010
2. ## math

a bag contains 9 green marbles and 11 white marbles. you select a marble at random. what are the odds in favor of picking a green marble? A.) 9:20 B.) 2:9 C.) 11:9 D.) 9:11

asked by math test need help!!! plz asap on May 19, 2017
3. ## Using Geometry in Probability

Allen and Bethany each arrive at a party at a random time between 1:00 and 2:00. Each stays for 15 minutes, then leaves. What is the probability that Allen and Bethany see each other at the party?

asked by Jonathan on July 6, 2018
4. ## math

suppose you choose a letter at random from the word ARITHMETIC. What are the odds in favor of selecting a vowel? What are the odds against selecting a vowel?

asked by Anonymous on November 4, 2010
5. ## Maths

The weight (in gm ) if 100 apples picked at random from a basket Weight in gm30-45 45-60 75-90 90-105 105-120 Number of apples 21 24 15 12 17 11

asked by The weight(in gm) if 100apples picked at random from a basket on December 20, 2016
6. ## math

Two representatives are chosen at random from a group of 100 students that has 50 girls and 50 boys. What is the probability that the representatives seledted are either both boys or both girls?

asked by karen on March 14, 2012
7. ## Stat

6% of american drivers read the newspaper while driving if 300 drivers are selected at random find the probability that between 15 and 25 say they read while driving

asked by Anonymous on April 30, 2012
8. ## math *check*

A bag contains 9 green marbles and 11 white marbles. You select a marble at random. What are the odds in favor of picking a green marble? A. 9:20 B. 2:9 C. 11:9 D. 9:11***?

asked by Me on June 10, 2014
9. ## theoretical probability

Each student in a class of 25 students wrote down a random digit. What is the predicted number of students who wrote a digit that is greater than 7? The answer is 5... How did they get 5? THANK YOU!!

asked by Tim on February 20, 2016
10. ## math

a) from a to of 12 flatres, 4 are selected at random. if the lot contains 4 defective flares (flares that wilt fire), what is the probability that all 4 will not work? B) what is the probability that at most 2 will not work?

asked by josh on December 4, 2016
11. ## College Math

Four balls are selected at random without replacement from an urn containing four white balls and five blue balls. Find the probability of the given event. ​ All of the balls are blue.

asked by Bobbie on December 7, 2016
12. ## Elementary Stats

A recent survey found that 70% of all adults over 50 wear glasses for driving. In a random sample of 10 adults over 50, what is the probability that exactly eight wear glasses?

asked by Angela on July 28, 2010
13. ## statistics

70% of Amerians file their taxes electronically. For a group of 12 American adults who were selected at random, what is the probability that at least five of them file their taxes electronically?

asked by Ashley on May 13, 2011
14. ## Statistics

70% of Americans file their taxes electronically. For a group of 30 American adults who were selected at random, what is the probability that exactly 10 of them do not file their taxes electronically.

asked by Ashley on May 13, 2011
15. ## Math

A recent survey found that 70% of all adults over 50 wear glasses for driving. In a random sample of 10 adults over 50, what is the probability that exactly eight wear glasses?

asked by A on July 29, 2010
16. ## Statistics

Records show that 29% of all payments to a mail-order company are submitted aftr the due date. Suppose 50 payments are submitted this week. Let r be a random variable that represents the number of payments that are late. Use the normal approximanition to

asked by Regina Turner on December 5, 2012
17. ## Math

My couch potato friend enjoys sitting in front of the TV and grabbing handfuls of 4 chocolates at random from his snack jar. Unbeknownst to him, I have replaced one of the 26 chocolates in his jar with a cashew. (He hates cashews with a passion.) How many

asked by Sarah on April 14, 2011
18. ## Math

Segments parallel to the sides are used to divide a square board 3 ft on each side into 9 equal-size smaller squares. If the board is in a level position and a grain of rice lands on the board at a random point, what is the probability that it lands on a

asked by Kym on September 20, 2011
19. ## Math

Which is the best way to obtain a random sample when surveying a high school with 800 students about what to serve in the cafeteria. A.Only ask the 11th grade class. B.Draw a list of 50 students from a bowl with every student's name in it. C.Ask everyone

asked by Anonymous on June 25, 2015
20. ## Statistics

The average age of vehicles registered in the united states is 96 months, with a standard deviation of 16 months. If a random sample of 36 vehicles is selected, find the probability that the mean of their ages is between 90 and 100 months. Provide four

asked by Darren on March 5, 2012
21. ## Chemistry

I just did an experiment on the enthalpy of combustion of different alcohols, and for my report, I've written that the condition of the wick is a source of random error, but i can't seem to explain it. I've written that it affects the rate of burning of

asked by TP on April 7, 2009
22. ## Statistics

A firm claims that only 10% of it's accounts receivables are over 30 days past due. The bank that supplies working capital or interim laons to the fimrs is suspect of the figure and accordingly takes a random samole of 100 accounts of the firm. Find the

asked by Leslie Meagan on January 3, 2015
23. ## english

please send me some example about that essay, "Away to decrease your chance of becoming a victime of random violence" There are no "examples" of essays here. You must write your own; then post it and someone here will be able to give you feedback. Here are

asked by louise on December 1, 2006
24. ## statistics

A politician claims that she will receive 66% of the vote in an upcoming election. The results of a properly designed random sample of 145 voters showed that 80 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.01

asked by Err on December 5, 2014
25. ## statistics

A study involving the economic burden of congestive heart failure found that the lengths of hospital stays for patients had a mean of 7.8 days with a standard deviation of 9.1 days. For random samples of size 40, find the sample mean length of stay that is

asked by ali awan on May 8, 2013
26. ## Algebra 2

A random sample of 5000 people was chosen for a survey. 54% of them said they didn't have children under 18 living at home. Find the 95% confidence interval. Round answer to 4 significant digits and give lowest and highest values of confidence Interval. I

asked by Anonymous on December 2, 2015
27. ## math-stats

There are 40 items in which 8 are defective. if 6 items are selected at random, what is the probability that 4 are non defective?

asked by on March 20, 2016
28. ## Math

Part of the population of 4,750 elk at a wildlife preserve is infected with a parasite. A random sample of 50 elk shows that 3 of them are infected. How many elk are likely to be infected?

asked by Ja'Quavius on November 15, 2018
29. ## statistics

Suppose that 30% of all telephone calls at work are for personal reasons. If a random sample of 15 is taken, let X be the number of personal calls. The standard deviation of the # of personal calls is:

asked by Anonymous on June 5, 2013
30. ## math

A garden has a total of 10 flowers. Three are yellow, two are white and five are blue. If you select 2 at random without replacement, find the probability that:a. none of the flowers are yellow. b.at least one of the flowers is yellow.

asked by Kim on April 17, 2011
31. ## probability and statistic

Suppose that the number of asbestos particles in a sample of 1 squared centimeter of dust is a Poisson random variable with a mean of 1000. What is the probability that 10 squared centimeters of dust contains more than 10090 particles? Round your answer to

asked by Sarah on July 1, 2016
32. ## maths

There are 5 lemon sweets and 4 orange sweets in a bag, susan takes one out randomly and eats it then ann takes one out at random. calculate the probability that they both take out a sweet of the same flavour. Is there 3 possible outcomes. I am really stuck

asked by rennie on September 29, 2016
33. ## Statistics

A scientist in Smallville tested the cholesterol of a random sample of 35 town residents. He constructed the following confidence interval: t-interval for μ: with 99.00% Confidence: 188 < μ(Cholesterol) < 206 What is the margin of error? A) 18 B) 9 C)

asked by Katelyn on November 7, 2013
34. ## statistics

A random sample of size 81 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 43 minutes, and the sample standard deviation 5.71 minutes. Construct a 95% confidence

asked by Devika on July 16, 2012
35. ## statistical reasoning

One hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. Colorblind Not Colorblind Total Male 8 52 60 Female 2 38 40 Total 10 90 100 Find the

asked by Anonymous on April 14, 2017
36. ## UMD

A new car that is a gas- and electric-powered hybrid has recently hit the market. The distance traveled on one gallon of fuel follows an exponential distributed with a mean of 63 miles. One car is selected at random and is driven on one gallon of gas. What

asked by John on March 15, 2013
37. ## probability

suppose that the times taken to complete an online test are normally distributed with a mean of 45 minutes and a standard deviation of 12 minutes. find the probability a. that for a randomly selected test, the time taken was more than 1 hour. b. that the

asked by Jennifer on January 22, 2013
38. ## math 12

A manufacturer of cereal finds that the masses of cereal in a company's 200-g package are normally distributed with a mean of 200g and a standard deviation of 16.3g a) What proportion of these boxes contain between 183.7g and 216.3g of cereal? b) What is

asked by kitkat on January 19, 2011
39. ## problem and statistics

In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. X is the minutes studied, and Y is the test score. x : {20,30,45,60,80,90,45,120,90,70} y:

asked by Zikera on March 9, 2015
40. ## statistics

1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence

asked by Anonymous on July 16, 2010
41. ## statistics

A poll claims that 70% of the population is for a new amendment. A random sample of 49 people showed that 27 voted in favor of the new amendment. Give a 95% confidence interval. Give lower limit and upper limit accurate to four decimal places

asked by robert on March 30, 2012
42. ## math

A druggist wishes to select three brands of aspirin to sell in his store. He has five major brands to choose from: A, B, C, D and E. If he selects the three brands at random, what is the probability that he will select the following? (a) brand B (b) brands

asked by sam on February 27, 2011
43. ## elementary statistics

56% of families had no children under the age of 18;17% had no child;18% had two children;6% had three children; and 3% had four or more children. If a family is selected at random, find the probabilty that the family has less than three children(express

asked by goldielocks on March 4, 2012
44. ## Math help Ms,Sue Please!!!

Note: Your teacher will grade your responses to questions 18 and 19 to ensure that you receive proper credit for your answers. 18. You are surveying students to find out their opinion of the quality of food served in the school cafeteria. You decide to

asked by on May 24, 2017
45. ## infinite mathematic

Section 6.8: Table1: Customer# Random# Time req. Teller Start time End Time 1 10 8 A 9:00 9:08 2 7 5 B 9:00 9:05 3 2 3 C 9:00 9:03 4 3 3 C 9:03 9:06 5 1 3 B 9:05 9:08 6 6 5 C 9:06 9:11 7 4 3 A 9:08 9:11 8 3 3 B 9:08 9:11 9 1 3 A 9:11 9:14 10 10 8 B 9:11

asked by ty on June 22, 2009
46. ## Statistics

A firm claims that only 10% of its accounts receivables are over 30 days past due. The bank that supplies working capital or interim loans to the firm is suspect of the figure and accordingly takes a random of 100 accounts of the firm. Find probability

asked by Leo Elvis on March 16, 2015
47. ## Maths- Probabilty

1. From a bag containing 5 gold and 3 red marbles that feel identical, one is drawn at random. If the first marble drawn is not replaced before the second is drawn: i) Explain why the probability of picking the second gold marble is 4/7 and why the

asked by Kesha on February 19, 2010
48. ## Math

1. A bag contains 9 tiles numbered 1 to 9. P(4) = (1 point) experimental; the result is found by repeating an experiment. experimental; the result is based on the number of possible outcomes. theoretical; the result is found by repeating an experiment.

asked by Me on April 18, 2016
49. ## math

Let x1,x2,x3 be random sample with pdf f(x)=exp(-x),x>0 find the joint pdf of y1=x1/x2, y2=x3/(x1+x2),y3=x1+x2 find pdf of y1 Are y1,y2,y3 independent?

asked by assma on February 9, 2015
50. ## math

Let x1,x2,x3 be random sample with pdf f(x)=exp(-x),x>0 find the joint pdf of y1=x1/x2, y2=x3/(x1+x2),y3=x1+x2 find pdf of y1 Are y1,y2,y3 independent?

asked by assma on February 9, 2015
51. ## math

let X1,X2,X3 be random sample with pdf f(x)=exp(-x),x>0,find the joint pdf of Y1=X1/X2, Y2=X3/(X1+X2) ,Y3=X1+X2, and find pdf of Y1. Are Y1,Y2,Y3 independent?

asked by assma on February 8, 2015
52. ## stats

A random sample of n=16 scores is obtained from a population with a mean of µ= 80 and a treatment is administered to the sample. After treatment, the sample

asked by delaney on March 20, 2013
53. ## math

let X1,X2,X3 be random sample with pdf f(x)=exp(-x),x>0,find the joint pdf of Y1=X1/X2, Y2=X3/(X1+X2) ,Y3=X1+X2, and find pdf of Y1. Are Y1,Y2,Y3 independent?

asked by assma on February 8, 2015
54. ## Probability

you need 4 eggs , there are 12 eggs in the refrigerator but do not realise that 2 of these are rotten . what is the probability that none is rotten of the 4 eggs you choose at random ?

asked by ashi on October 17, 2015
55. ## Stats

Y is a discrete random variable. The table below reports the values of Y and the corresponding frequency, n (the number of observations for each value). Based on this information, what is the expected value of Y? Y n 50 50 70 100 100 200 200 50 120 100 140

asked by ashley on October 29, 2015
56. ## statistics

We’re writing a test case that samples a “random” black box. Given n numbers, how many times would we need to sample the black box to have n unique responses with a 99.9% confidence? Eg, if we were rolling a six-sided die, how many times would we

asked by Alex on October 27, 2011
57. ## statistics

Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the

asked by frank on July 19, 2014
58. ## Statstics

In a random sample of 450 cases of juice, 3 of the 48 chosen cases had major defects. The sampling method had a margin of error of 0.04. What is the interval estimate for the proportion that would have defects in the form (lower limit, upper limit)?

asked by Kimmie on December 8, 2016
59. ## Statistics

Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round to

asked by Rob on April 30, 2013
60. ## Math

The medical records of infants delivered at Kaiser Memorial Hospital show that the infants' lengths at birth (in inches) are normally distributed with a mean of 22 and a standard deviation of 2.1. Find the probability that an infant selected at random from

asked by Ashley on October 28, 2014
61. ## statistics

The Redsox were accused of cheating their soda customers by not putting enough soda in the 12 ounce cup. When 15 cups were selected at random, they were found to have a mean of 11.7 ounces with a standard deviation of 0.5 ounces. At the .01 significance

asked by Veronica Marie on December 10, 2010
62. ## math

In a wildlife preserve, a random sample of the population of 150 raccoons was caught and weighed. The result, given in pounds, were 17,19,20,21,23,27,28,28,28 and 32. Jean made the qualitative statement, "The average weight of the raccoon population is 25

asked by Tim on February 25, 2016
63. ## biology

All of the following important concepts of population genetics are due to random events or chance except mutation natural selection the bottleneck effect the founder effect sexual recombination I am pretty sure that the answer would be "natural selection",

asked by Gail on January 31, 2009
64. ## Probability/Statistics

A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that

asked by Amy on July 11, 2009
65. ## stor

Suppose that you flip a fair coin (P(H)=P(T)=1 2 ) three times and you record if it landed on heads, H, or tails, T. (a) What is the sample space of this experiment? What is the probability of each event? (b) [1 pt] Let X be the number of times that you

asked by ami on September 29, 2012
66. ## statistics

Women comprise 80.3% of all elementary school teachers. In a random sample of 300 elementary teachers, what is the probability that more the 3/4 are women?

asked by Lori on October 9, 2010
67. ## Probabilities

A bag contains 5 red, 3 green, 12 white and 7 blue marbles. One is drawn at random. With is the probability it is green if it is not red or blue?

asked by Andrey L on April 21, 2009
68. ## STATISTICS

a team of 3 is to be chosen from 4 boys and 5 girls. if X is the random variable of the number of girls in the team find the Expected variable X. E(X)

asked by KALAN ENILEOHS on February 25, 2015
69. ## Math

A jar contains 5 green erasers, 2 striped erasers, 4 pink erasers, and 3 white erasers. You select an eraser at random. What is P(not pink)? A. 4/14 B. 2/5 C. 5/7 D. 1/7

asked by SCCA on April 11, 2017
70. ## probability

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white

asked by sam on February 27, 2011
71. ## math

A jar contains 6 pink, 7 violet, 26 green, and 13 blue marbles. A marble is drawn at random. P(violet, pink, or blue). V = 7/52 P = 6/52 B = 13/52

asked by Anonymous on March 13, 2014
72. ## Statistics

A jar contains 12 marbles, 5 of which are blue and 7 of which are red. If 4 marbles are chosen at random and without replacement, what is the probability of selecting 3 blue ones and 1 red one?

asked by crystal on May 9, 2012
73. ## math

On the last math quiz, there were four A's, two B's, five C's, and one D's. If the math quizzes were returned to the students in random order, what is the probability that the first quiz returned to a student was an A or a B?

asked by Anonymous on April 24, 2012
74. ## statistics

37% of all doctors are family practitioners. If four doctors are picked at random, what is the probability that all four are family practitioners? a.1.48 b.0.0187 c. 0.0168 d. .1369

asked by Kate on September 15, 2011
75. ## data 12

From a lot of 12 flares, 4 are selected at random. if the lot has 4 defective flares, what is the probability that all 4 will not work. B. whats the pobablity that at most 2 will not work?

asked by Linda on October 8, 2008
76. ## math

A jar contains 5 green erasers, 2 striped erasers, 4 pink erasers, and 3 white erasers. You select an eraser at random. What is P(pink)? a)2/7 b)2/5 c)5/7 d)4/7

asked by #HOMEWORK on May 10, 2015
77. ## Math

John has 21 coloured pencils in a bag. 6 of the pencils are red. John pulls out one pencil at random. What is the probability that it will be red?

asked by Chelsea on August 16, 2016
78. ## Math liberal Arts

A bag contains 5 red marbles, 4 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability that it is not blue?

asked by Jamie on November 20, 2014
79. ## Math

Five balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.

asked by Brittany on April 10, 2011
80. ## Math

If there are 12 green pencils, 4 red pencils, 7 blue pencils, and 2 black pencils, what is the chance of picking a red pencil at random?

asked by Hannah on March 23, 2017
81. ## math

Each student in a class of 25 students wrote down a random digit. What is the predicted number of students who wrote a digit that is greater than 7? THANK YOU!!

asked by Tim on February 20, 2016
82. ## math probability

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.

asked by Sam on March 1, 2011
83. ## statistics (college

An insurance company checks police records (in a city) on 500 accidents selected at random and notes that teenagers were at the wheel in 120 of them. It is desired to test if this information indicate that more than 20% of auto accidents involve teenage

asked by Hannah on May 24, 2012
84. ## Math

The table below shows the number of deaths in the U.S. in a year due to a variety of causes. For these questions, assume these values are not changing from year to year, and that the population of the United States is 312 million people. a) What is the

asked by Anonymous on April 1, 2016

Photography - Two men and a woman are lined up to have their picture taken. If they are arranged at random, what is the probability that (A) the woman will be on the left in the picture? (B) the woman will be in the middle in the picture?

asked by Dan on September 23, 2007

Face cards are removed from a standard deck of cards and the rest are set aside. two cards are drawn at random from the face cards. once a card is selected, it is not replaced. Find each possibility. P(jack and then king)? P(two black cards) answer 1/2 ?

asked by jill on April 14, 2015
87. ## Statistics

A random sample of 14 college female students revealed their average height was 66.1 inches. a) How many students should be in a samle if a 95% confidence interval is to have a margin of error of only plus/minus 1 inch? Is that the only information you

asked by Kasey on July 30, 2007
88. ## Finite Math

A bowl contains 10 red balls, 5 blue balls, and 8 green balls. A woman selects balls at random without looking in the bowl. How many balls must she select to be sure that she has at least one ball of each color?

asked by Ronnie on November 14, 2015
89. ## Child Psychology

In terms of development, Piaget believed that A. child development is haphazard, random, and based on experience. B. cognitive development proceeds by stages that are universal across cultures. C. children learn in different sequences based on their

asked by Jasmin on July 11, 2011
90. ## Statistics

You want to know if there's a difference between the proportions of high school students and college students who read newspapers regularly. out of a random sample of 500 high-school students, 287 say they read newspapers regularly, and out of a random

asked by debbie on May 1, 2014
91. ## statistics

A student claims the average amount of time spent studying for an exam is less than or equal to 120 minutes. A random sample of 101 students is drawn from a normal distribution. The sample mean is 140 with a sample standard deviation of 20. Test the claim

asked by Matt on May 8, 2014
92. ## American Government

A member of Congress who wants to act on what the majority of his or her constituency thinks on a particular issue would be advised to respond to which of the following indicators? A. letters from constituents B. the editorial positions of newspapers in

asked by Liz on October 3, 2012
93. ## statistical reasoning

One hundred people are selected at random and tested for colorblindness to determine whether gender and colorblindness are independent. The following counts were observed. Colorblind Not Colorblind Total Male 7 53 60 Female 1 39 40 Total 8 92 100 State the

asked by Anonymous on April 14, 2017
94. ## Stats

A random sample of 30 women drank an average of 15 cups of coffee per week during examination finals, with the sample standard deviation equal to 3 cups. A upper limit of an approximate confidence interval with 95% of the population average cup drunk is ?

asked by Mariaan on March 30, 2010
95. ## Math

you want to determine the average age when people got their driver's licence you want to collect data from a random sample of at least 400 people Which of these is most valid for collecting data? * Survey an equal number of students of driving age teachers

asked by Mathe on June 7, 2017
96. ## statistics

A student government representative at a local university claims that 60% of all the undergraduate students favor a move to Division I in college football. A simple random sample of 250 undergraduate students is selected. What is the probability that the

asked by LO on February 21, 2015
97. ## Statistics

Consider the hypothesis test given by Ho:u=530, H1:u does not equal 530. In a random sample of 85 subjects, the sample mean is found to be 522.3. Also, the population standard deviation is 29. Determine the P-value for this test. Is there sufficient

asked by Sandy on March 9, 2013
98. ## Algebra 2

A music teacher wants to determine the music performances of students. A survey of which group would produce a random sample. students in school band students attending the jazz concert students in every odd numbered homeroom There was choices about sports

asked by Chelsey on November 19, 2007
99. ## Mathematics Help

Giving a test to a group of students, the grades and genders are summarized below. A B C Total Male 3 15 11 29 Female 14 9 12 35 Total 17 24 23 64 If one student is chosen at random, find the probability that the student was female OR received a grade of

asked by Anonymous on October 9, 2016
100. ## Math

A national study reports that 20% of college freshman have GPA above 3.5. We wish to determine if the corresponding proportion is higher at a local university. To conduct the test we select a random sample of 100 freshmen and determine that 26 of them have

asked by Kathy on April 30, 2013