# random

4,782 results, page 13
1. ## biology

a DNA chip contain set of random hexanucleotide probes.out of 4096 probe how many will form perfect complementary duplexes with sequestionwithin the 14 nucleotide single target DNA 5'GAACTGCATTGATA3'

asked by papri on April 14, 2009
2. ## math

Determine whether the situation calls for a discrete or continuous random variable. The number of freshmen in the required course, English 101 The braking time of a car I think the first one discrete and the second is continous is this correct?

asked by KiKi on April 25, 2010
3. ## Psychology

Choose from these answers: [(A):histogram] [(B):population] [(C):parameter] [(D):statistic] [(E):random sample] 1. A ________ provides a numerical description of a sample. 2.The number of people in the U.S. as measured by the U.S.Census is a _______. For

asked by Anonymous on April 24, 2015
4. ## statistics

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of \$30 and a standard deviation of \$9. What is the probability that a randomly selected customer will spend between

asked by Selene on September 24, 2013
5. ## PROBABILITY MATH

An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer. Could some one please help me? And explain to me how they got the answer? and is there another way

asked by HM on November 9, 2011
6. ## Maths

The diameter of a ball bearing is to have an averageof 2.0 Cm. A random sampling of 10 bearings is selected every hour to check the diameters. The sample selected at 9 a.m gave the following measurements: 2.02, 2.04, 2.00, 1.98, 2.04, 2.04, 2.00, 2.02,

asked by Zinnia on August 13, 2011
7. ## Statistics

A population of values has a normal distribution with μ=76.6 and σ=43.9 You intend to draw a random sample of size n=142. Find P75, which is the score separating the bottom 75% scores from the top 25% scores.

asked by Zameer on January 2, 2017
8. ## statistics

A large group of students has taken a college entrance exam. The scores on the exam are such that the mean = 52 and the standard deviation = 11 Find the probability that a student, selected at random, earned a score lower than 63.

asked by MM on June 24, 2011
9. ## biology

a DNA chip contain set of random hexanucleotide probes.out of 4096 probe how many will form perfect complementary duplexes with sequestionwithin the 14 nucleotide single target DNA 5'GAACTGCATTGATA3'

asked by papri on April 14, 2009
10. ## math

make a tree diagram for: two methods A and B are available for teaching a certain industrial skill. the failure rate is 20% for A and 10% for B. however, B is more expensive and is therefore only used 30% of the time (A is used the other 70%). A worker is

asked by Anonymous on November 9, 2010
11. ## Stats

The average price for new mobile homes is known to be distributed with a standard deviation of 350. if a random rample of 49 homes resulted in a sample mean of 38500, obtain a 90% confidence interval on the population mean.

asked by Sally on March 24, 2009
12. ## statistics

the mean scale score on the mathematics examination of ninth grade students in new york state was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probabilty that his score was 91 or higher?

asked by kelly on February 9, 2013
13. ## statistics

A test of writing ability is given to a random sample of students before and after they completed a formal writing course. The results are given below. Construct a 99% confidence interval for the mean difference between the before and after scores. You may

asked by heather on October 21, 2009
14. ## Stats

Assume that the table below represents the distribution of X. Note that X is a discrete random variable. The second column reports the number of observations for each value of X. Based on this information, what is the value of the Cumulative Distribution

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

Suppose that the test scores for a college entrance exam are normally distributed with a mean of 450 and a standard deviation of 100. If a student is selected at random what is the probability that the student will score above 600?

asked by kevin on April 24, 2013
16. ## statistics

A test of writing ability is given to a random sample of students before and after they completed a formal writing course. The results are given below. Construct a 99% confidence interval for the mean difference between the before and after scores. You may

asked by heather on October 21, 2009
17. ## stats

A popular retail store knows that the purchase amounts by its customers is a random variable that follows a normal distribution with a mean of \$30 and a standard deviation of \$9. What is the probability that a randomly selected customer will spend \$20 or

asked by cate on March 29, 2013
18. ## math

Hi! I'm Maddie. I need some help on my homework. Here are three problems I need help with: A bowl contains only red marbles, blue marbles and green marbles. The probability of selecting a red marble from the bowl is 3/13. The probability of selecting a

19. ## statistics

Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 |

asked by anna on February 23, 2014
20. ## Maths

Two concentric circles are such that one circle has half the radius of the other. If a point is chosen at random inside the larger circle, the probability that it also lands outside the smaller circle is?

asked by Matthew on November 21, 2017
21. ## statistics

Construct a 95% confidence interval for the population mean. 5. Airfare A random sample of airfare prices (in dollars) for a one-way ticket airfare between two cities MN. Key: 21|1=211 21 | 1 2 22 | 1 1 1 2 3 5 7 8 23 | 2 3 4 7 7 8 9 9 24 | 2 3 4 8 8 25 |

asked by anna on February 23, 2014
22. ## Math

*Sigh* Can someone explain to me how I would work through this problem? An honest coin tossed n=3600 times. Let the random variable Y denote the number of tails tossed. (a) find the mean and the standard deviation of the distribution of the random variable

asked by SherylA on October 5, 2006
23. ## Math

oel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

asked by Allison Carson on February 9, 2016
24. ## Math 120

A box contains 10 ​transistors,4 of which are defective. If 4 are selected at​ random, find the probability that a. All are defective. b. None are defective.

asked by Beth on March 23, 2017
25. ## Math

If a grade was drawn at random from the data shown below, what is the probability that the grade is not a B? Grade Frequency A 2 B 8 C 11 D 2 F 1 I think it is 1 out of 5 or 4 but I am not sure? Please help :) Thank you much!

asked by Shannon on December 5, 2010
26. ## 10

A letter is picked random from the word COMPUTER. What is the probability that it is neither in the word met nor in the word up

asked by Anonymous on June 5, 2016
27. ## Math

Two cards are drawn at random from a standard deck of 52 cards. What is the probability that both cards are queens?

asked by Nora on March 10, 2010
28. ## Stats

a) IHI insurance is interested in determining whether younger drivers (below the age of 25) are more prone to motor accidents than older drivers (25 or older). A random sample of 70 IHI policyholders below the age of 25 were selected and whether they had

asked by Scott on October 9, 2010
29. ## statistics

What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of

asked by Terri on April 14, 2014
30. ## statistics

a simple random sample will be obtained from a normally distributed population. find the minimum sample size needed to be 95% confident that the sample standard deviation (s) is within 10% of sigma. please help!

asked by lucy on April 16, 2011
31. ## Math

Tickst number 1-15are placed in a hat ,2 Tickets Are drawn at random without replacement find the probability that both Numbers Are Greater then 9 B.) the First Number is Prime and the Second number is Composite?

asked by Roman on May 17, 2016
32. ## statistics

Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

asked by Rose on December 13, 2007
33. ## statistics

Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

asked by Rose on December 13, 2007
34. ## statistics

Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

asked by Rose on December 12, 2007
35. ## Mathematics

6 black counters and 4 white counters in bag A. 7 black counters and 3 white counters in bag B. 5 black counters and 5 white counters in bag C. Tarek takes at random a counter from bag A and puts the counter in bag B. He then takes at random a counter from

asked by Alexander on March 30, 2017
36. ## statistic

Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean =5.2

asked by Anonymous on November 6, 2013
37. ## Statistics

A box contains twelve candies, five reds, four greens, and three blues. You select one piece at random, then replace it, then you select another. If P(BG) is the probability of selecting a blue first and a green second, find the following probabilities. a.

asked by Keonn'a on October 13, 2018
38. ## science

List the five conditions that can disturb genetic equilibrium in a population I think Infinite population size, no mutation, no selection against a certain homozygous gene, random mating, no immigration/emigration Mutations. can someone let me know if this

asked by corie on February 8, 2013
39. ## Math

You are surveying students to find out their opinion of the quality of food served in the school cafeteria. You decide to poll only those students who buy hot lunch on a particular day. Is your sample random? Explain I think it would be but I'm not sure.

asked by Gwen on May 6, 2014
40. ## Math

Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A. Random B. Systematic C. Stratified D. None of

asked by Lana on January 14, 2016
41. ## Math

A set of dominoes has 28 dominos. There are 7 dominos called doubles with the same number of dots on each end. If Sara and Jake each take a rein picking domino at random and replacing it. What is the probability that they will both pick a double?

42. ## Math

Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

10. Using a table of random numbers, select six names from the following list of 10: Michael Susan Sara Kent Selma Harriet Annette David Sharon Ed How many of the six would you expect to be males, and how many would you expect to be females? Why?

asked by Lindsey on January 25, 2012
44. ## Geometry

Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

asked by Sambaran G. on May 5, 2013
45. ## Apologizes

Sorry that my friend was saying random things. I was grabbing a snack while he messed with my stuff on my phone. 🙄 He made me lose \$8 on my account. 😡 E'mod said, "Sorry." Though he didn't really sound sorry. Next time I'm bringing my phone with me

asked by Barry Vacker on February 5, 2019
46. ## statistics

Consider the following types of data that were obtained from a random sample of 49 credit card accounts. Identify all the averages that can be used to summarize the data.(Select all that apply) 1.Outstanding balance on each account: mode,median,mean?

asked by Trevor on September 15, 2012
47. ## Math Help

Two points are chosen uniformly at random on the unit circle and joined to make a chord C1. This process is repeated 17 more times to get chords C2,C3,…,C18. What is the expected number of pairs of chords that intersect?

48. ## Stats

The heights of men in the USA are normally distributed with a mean of 68 inches and a standard of 4 inches. What is the probability that the mean height of a random sample of 35 men is greater than 69) inches? (Round your answer(s) to 3 decimal places.)

asked by Morgan on June 23, 2011
49. ## Probability

Could someone please check this and let me know if I'm doing it correctly? Sammy and Sally each carry a bag containing banana, chocolate bar, and a licorice stick. Simutaneously, they take out a single good item and consume it. The possible food items that

asked by Mary on October 28, 2006
50. ## statistics

7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

asked by Anonymous on September 1, 2013
51. ## staistics

7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

asked by Eli on November 19, 2016
52. ## statistics

The heights of 10000 individuals are approximately normally distributed with a mean of 70 inches and a standard deviation of 3 inches. Find the probability that a person picked at random from this group will be between 65 and 74 inches tall.

asked by sohail on October 27, 2010
53. ## statistics

The heights of 10000 individuals are approximately normally distributed with a mean of 70 inches and a standard deviation of 3 inches. Find the probability that a person picked at random from this group will be between 65 and 74 inches tall.

asked by sohail on October 27, 2010
54. ## Statistics/Probability

The standard deviation of the masses of articles in a large population is 4.55 kg. Random samples of size 100 are drawn from the population. Find the probability that a sample mean will differ from the population mean by less than 0.8 kg.

asked by Koylar on July 17, 2014
55. ## statistics

a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

asked by erica on May 11, 2012
56. ## Math

A box has 8 blue and 5 green jelly beans. A bag has 6 blue and 8 green jelly beans. A jelly bean is selected at random from the box and placed in the bag. Then a jelly bean is selected at random from the bag. If a green jelly bean is selected from the bag,

asked by Kerry on October 24, 2012
57. ## Statistics

7. A random sample of n1 = 16 communities in western Kansas gave the following rates of hay fever per 1000 population for people under 25 years of age. 121 115 124 99 134 121 110 116 113 96 116 116 135 96 96 116 A random sample of n2 = 14 communities in

asked by Tab on January 26, 2011
58. ## statistics

2. A researcher measures the heart rate in a population of runners and finds they have an average heart rate of µ = 50, σ = 5. You do not need to show a graph, only computation work. 2A. Based on the average heart rate cited above, what proportion would

asked by chris on June 27, 2014
59. ## Math

Joel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

asked by Asia on February 12, 2016
60. ## Math

Joel scores in 80% of his games. His team is starting the playoffs, and if they make it to the state championship, they will have played 5 games. Joel wants to determine the probability that he scores in 4 of the 5 games. Which simulation design has an

asked by Anonymous on February 12, 2016
61. ## Math

i have my final tomorrow and this question was on my review? im having trouble with probability so... "your cat walks over the computer keyboard while you're away and hits three random letters. what is the probability that the word RAT appears" So on my

asked by Mandee on December 12, 2011
62. ## statistics

a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

asked by Khloe B on July 19, 2012
63. ## math

A politician claims that she will receive 59% of the vote in an upcoming election. The results of a properly designed random sample of 100 voters showed that 54 of those sampled will vote for her. Is it likely that her assertion is correct at the 0.05

asked by Lauren on November 10, 2013
64. ## Statistics

A random sample of state gasoline taxes is shown for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 0.21? assume normal distribution.

asked by Say on March 3, 2015

1)Identify the sampling method. You want to determine the number of text messages students at your school send in a month. You go to the cafeteria and randomly ask students as they come out of the lunch line. A)Random*** B)Systematic C)Stratified D)None of

asked by Sasha on June 1, 2015
66. ## MATH

Need help on the question below. A cat has a litter of 5 kittens. Which simulation could be used to determine the probability that exactly 3 kittens will be female? a. tossing 5 coins b. spinning a spinner with 5 equal parts c. using a random integers 1 to

asked by Brandi on December 12, 2013
67. ## statistics

The Stop N’ Go convenience chain recently selected a random sample of 10 customers. The store monitored the number of times each customer made a purchase at the store over a two-month period. The following data were collected:

asked by petrit on June 25, 2013
68. ## Statistics

The amount of fill(weight of contents)put into a glass jar of spaghetti sauce is normally distributed with mean=850g and standard deviation=8g.the probability that a random sample of 24 jars has a mean weight greater than 848g is?need help

asked by Joel on March 23, 2011
69. ## statistics

an archer shoots arrows at the bull's eye of a target and measures the distance from the center of the target to the arrow. identify the random variable of interest, determine whether it is discrete or continuous, and list its possible values

asked by Anonymous on November 6, 2016
70. ## statistics

A convenience store owner believes that the median number of lottery tickets sold per day is 49. A random sample of 20 days yields the data below. Find the critical value to test the owner's claim. 32 48 59 64 31 55 70 27 33 38 47 54 54 44 44 49 49 59 54

asked by Shelby Hacker on April 26, 2013
71. ## statistics

a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

asked by samuel on March 22, 2017
72. ## STATS

12- The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 19.22. A random sample of salespeople was taken and the number of cars each sold is listed her. 79 43 58 66 101 63 79 33 58 71 60 101 74 55 88

asked by Judy and group on April 1, 2010
73. ## Math

A number is drawn at random from {1,2,3,4,5,6}. What is the probability that either a number larger than 3 or an even number will occur?

asked by Mandeep on April 16, 2012
74. ## statistics

If X is a random variable which is normally distributed with a mean of 100, then P(X100) True or False?

asked by Leslie on May 9, 2008
75. ## statistics

A random sample of n = 9 scores is obtained from a population with ì = 50 and ó = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?

asked by Anonymous on November 6, 2011
76. ## John jay college

A random sample of n = 9 scores is obtained from a population with μ = 50 and σ = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?

asked by Samantha on July 22, 2012
77. ## math

1 number is selected at random from 0-9,find the probability that number is odd number

asked by kapil on March 21, 2016
78. ## math

Three cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability of the given event. (Round your answer to four decimal places.) Three cards of the same suit are drawn

asked by Anonymous on October 24, 2015
79. ## STATS

. The time to fly between New York City and Chicago is normally distributed with a mean of 180 minutes and a standard deviation of 17 minutes. What is the z-score that corresponds to a random variable X outcome of 190 minutes?

asked by Susan on February 8, 2015
80. ## statistics

A Packaging Company sells soda and claims each can contains 12 oz. A random sample of 15 sodas yielded a sample mean of 11.2 oz. Given the sample standard deviation is 0.3 oz, estimate the margin of error for a 90% confidence interval.

asked by robert on March 29, 2012
81. ## probability

Tad draws three cards at random, without replacement, from a deck of ten cards numbered 1 through 10. What is the probability that no two of the cards drawn have numbers that differ by 1? Express your answer as a common fraction.

asked by nikhil on February 19, 2017
82. ## math probability

Three cards are drawn at random without replacement from a standard fifty-two card deck of playing cards. What is the probability that among the three cards there is a pair or three of a kind? please provide complete solution with explanations:)

asked by K on December 19, 2017
83. ## probability

In a random sample of three integers between 1 and 365 inclusive, what is the probability, to three decimal place accuracy, that (a) the three numbers will all be di fferent; (b) the three numbers will not all be di fferent?

asked by denim on September 4, 2013
84. ## math

Write a system of equations, three equations/three unknowns, that has (1, 2, 3) as the solution. for this can I just write any random coefficient and then put that as equal to 1,2 or 3? or if not what type of math would I use?

asked by Samuel on November 6, 2017
85. ## probability

A random sample of six integers in the interval [1,42] is to be drawn. The numbers are selected randomly, one after the other, and repeats are allowed. What is the probability the six numbers in the sample will all be different?

asked by zach on September 4, 2013
86. ## statistics (math)

of college students 45% are women 8% have a GED. suppose a student is selected at random. Given that the selected employees is a woman. what is the probability that she has a GED

asked by tanya on November 28, 2015
87. ## MATH

NOT INDEPENDENT A box contains four white, three red, and two black marbles. Three marbles are chosen at random. a. What is the probability that all three are the same color? b. What is the probability that all three are different colors?

asked by Sally on April 28, 2015
88. ## probability

josie is about to draw a card at random from a standard deck of 52 playing cards. determine the probability that she will draw a red card or a 7. a) 1/2 b) 1/13 c) 7/13 d) 15/26 thank you

asked by nesa on November 3, 2017
89. ## math

The decimal parts of the logarithms of two numbers taken at random are found to 6 decimal places. What is the probability that the second number can be subtracted from the first number without "borrowing" ?

90. ## probability

Suppose 1 person is picked at random from this group of dog owners. The probability that the person chosen is at least 50 years old and has at least 1 dog equals

asked by shakara on April 6, 2011
91. ## statistics & probability

according to a survey, 30% of 18-25 year olds have blue eyes. In a random sample of 8 people in this age group what is the probability that exactly 0 have blue eyes?

There were 31 students who completed a survey. There were 13 boys and 18 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

asked by Anonymous on December 16, 2010
93. ## statistics

A small company has 9 female employees and 15 male employees. In how many ways can 8 employees be selected at random for drug testing if exactly 5 of the employees must be males?

asked by Kasey on November 11, 2010
94. ## math

in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy and a girl are chosen at random what is the probability that both of them can ride a bicycle

asked by unice on September 12, 2018
95. ## statistics

Come up with a unique way to choose random samples from a specific data set, also explain how you will assign each data item and how each item will be selected

asked by Anita on November 9, 2010
96. ## probability help!

In a random sample of three integers between 1 and 365 inclusive, what is the probability, to three decimal place accuracy, that (a) the three numbers will all be di fferent; (b) the three numbers will not all be di fferent?

asked by denim on September 5, 2013
97. ## math

How would I figure out a random tile grid pattern for a room that is 25'1" in length and 12'7" in width with tile that is 16"x16" and 12"x12" with the majority being 12"x12"?

asked by Faith on May 10, 2013
98. ## math

There were 25 students who completed a survey. There were 11 boys and 14 girls. One survey was picked at random. To the nearest hundredth, what is the probability it was completed by a girl?

asked by mara on April 9, 2012
99. ## Math Finite

A box contains 15 pens of which 4 are defective. A random sample of 3 pens is taken without replacement and without regard to order. What is the probability of selecting at least one defective pen?

asked by Amy on December 9, 2010
100. ## statistics

A group of six students all have different grades in statistics. The median mark in the group is 68. If two of the six students are selected at random, what is the probability that both have marks greater than 68?

asked by Kendra on November 7, 2011