# random

4,782 results, page 5
1. ## Networks

Consider the model of "Growing Random Networks" described in lecture 3.1 (so the first model where links are added to existing nodes uniformly at random), with m=10. At date t=40, what are: (1) the expected degree for node 15 born at i=15, and (2) the

asked by qwerty on October 9, 2014
2. ## statistics

what is the probability that the random variable has a value between 5.3 and 5.7

asked by dianne on April 1, 2016
3. ## math

A number from 20 to 30 is drawn at random. P(not a 23) I think 1/11

asked by Anonymous on March 13, 2014
4. ## math

Let x1,x2,x3 be random sample of f(x)=2x,0

asked by assma on December 28, 2014
5. ## math

Let x1,x2,x3,x4,x5 be random sample of f(x)=(x+1)/2,-1

asked by assma on December 28, 2014
6. ## statistics

4.6 is a N(3.5, 1.2) random variable. What is its standard value, Z?

asked by lisa on May 18, 2016
7. ## math

Show that for random variables X, Y and Z we have E[E[E[x|y]|z]] = E[X]:

asked by hsuan on May 3, 2013
8. ## Mathematics

1.​At your summer job with a research company, you must get a random sample of people from your town to answer a question about spending habits. Which of the following methods is most likely to be random? a. You survey customers at the local shopping

asked by Queen/Halle on April 13, 2016
9. ## Statistics

the international olympic committee states that the female participate in the 2004 Summer Olympic Games was 42%, even with the new sports for women such as weight lifting, hammer throw, and modern pentathalon being added to the Games. Broadcasting and

asked by Crystal on April 12, 2010
10. ## Math

Someone please help me, I do not understand how to solve this problem: Let x be a random variable representing dividend yield of bank stocks. We may assume that x has a normal distribution with σ = 2.0%. A random sample of 10 bank stocks gave the

asked by Riana on December 11, 2016
11. ## Alegebra 1

Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected at random from urn B. What is the probability that a 4 is drawn from A followed by a 2 from B?

asked by maria on September 8, 2009
12. ## math

Consider a box that contains 14 red balls,12 blue balls and 9 yellow balls.A ball is drawn at random and the color is noted and then put back inside the box.Then,another ball is drawn at random.Find the probability? a.both are blue b.both balls are yellow

asked by Anonymous on January 5, 2017
13. ## Stats

The Geometric distribution is used when we want to ﬁnd the probability of performing a sequence of trials with X “failures” before the ﬁrst “success”, where a “success” occurs with some probability p. We can denote such a random variable as

asked by Becca on September 30, 2013
14. ## Prob and Stat

A tire manufacturer guarantess that its tires will last for at least 60,000 miles. If the tire fails earlier, the manufacturer offers a prorated replacement. Too many such replacements are bad for business, so the manufacturer tests tires at random to see

asked by Angela on May 17, 2011
15. ## math

In the SmallState Lottery, three white balls are drawn (at random) from twenty balls numbered 1 through 20, and a blue SuperBall is drawn (at random) from ten balls numbered 21 through 30. When you buy a ticket, you select three numbers from 1-20 and one

asked by Jon on June 30, 2016
16. ## Math

In the SmallState Lottery, three white balls are drawn (at random) from twenty balls numbered 1 through 20, and a blue SuperBall is drawn (at random) from ten balls numbered 21 through 30. When you buy a ticket, you select three numbers from 1-20 and one

asked by Help plz on April 27, 2016
17. ## statistic

3. In studying the efficiency of the federal court system, we look at the random variable, X, the amount of time elapsing between the filing of a charge and the trial date. A random sample of n = 86 cases yields a sample mean of 11.4 months, with sample

asked by Tian on January 30, 2011
18. ## statistics

Starting with a population that is normally distributed with a mean of 100 and a standard deviation of 12, answer the following questions (if possible). a. What is the probability of randomly drawing a single score between 100 and 106, p(100 < X < 106)? b.

asked by Daniel on October 15, 2011
19. ## Statistics

The International Olympic Committee states that the female participation in the 2000 Summer Olympic Games was 42%, even with new sports such as weight lifting, hammer throw, and modern pentathlon being added to the Games. Broadcasting and clothing

asked by LT on October 29, 2007
20. ## math

You roll a number cube numbered from 1 to 6. what is the probability you roll a number divisible by 4? Answer: I think 2/6 or 1/3 A number from 16 to 23 is drawn at random. what is the probability you draw a number greater than 18? Answer 5/7 A jar

asked by Anonymous on March 13, 2014
21. ## college stats

help please!!! 1. The average number of bumped passengers per day on FliRite Airlines is 2.47 with a standard deviation of 1.75. For a random sample of 40 days, what is the chance the average number of bumped passengers in the sample is between 2 and 2.75?

asked by penelope on July 12, 2013
22. ## math

Which sample is better for making a prediction? Why? Sample A: A random sample of 10 customers leaving a store Sample B: A random sample of 100 customers leaving a store i think maybe sample a would be more better for just a prediction because it's just 10

asked by MAX on May 21, 2016
23. ## Math

1. A customer comes into Pierre's and orders a random assortment of 6 danish. At the time she comes in, there are 26 danish sitting out: 12 raspberry, 8 cheese, and 6 cinnamon. Assume the danish are not replaced. a) What is the probability that the third

asked by Cece on November 10, 2013
24. ## statistics

Bill has completed a 10-question multiple-choice test on which he answered 7 questions correctly. Each question had one correct answer to be chosen from five alternatives. Bill says that he answered the test by randomly guessing the answers without reading

asked by elegantina on January 28, 2017
25. ## Probability

Manhole explosions (usually caused by gas leaks and sparks) are on the rise in your city. On any given day, the manhole cover near your house explodes with some unknown probability, which is the same across all days. We model this unknown probability of

asked by qwerty on April 21, 2015
26. ## Statics

You suspect that, on the average, professional baseball players are older than professional football players. A random sample of 30 professional baseball players has a mean age of 28.8 years (assume ó = 4). A random sample of 40 professional football

asked by Heather on December 2, 2012
27. ## Elementary Statistic

twenty-five percent of all death are caused by diseases of the heart Ischemic heart disease accounts for 16.4% of all death and heart failure for 2.3% choose one death at random. What is the probability that it is from ischemic heart disease given that it

asked by Angela on June 24, 2015
28. ## math

Let x1,x2,x3 be random sample of f(x)=exp(-x),x>0,zero elsewhere,if y1=x1/x2,y2=x3/(x1+x2),y3=x1+x2 find g(y1,y2,y3),g(y1),g(y2,y3)

asked by assma on December 28, 2014
29. ## intro to psychology

Random assignment can be described as a research method:

asked by elly on June 19, 2015
30. ## math

A number from 20 to 30 is drawn at random. Posibility of it not a 23

asked by grace on May 13, 2014
31. ## math(statistics)

suppose a random variable X can equal to 1,2,3,4,or 5. if P(x3)=.5 (a)p(x=3) and b P(x

asked by Ron on March 19, 2013
32. ## introduction to psychology 1

Random assignment can be described as a research method:

asked by Anonymous on August 17, 2013
33. ## introduction to psychology 1

Random assignment can be described as a research method:

asked by Anonymous on August 17, 2013
34. ## STAT

A random variable X2 assumes only positive value.?

asked by azriel ed pagayunan on October 11, 2011
35. ## Statistics

A random variable x has the following probability distribution: x f(x) 0 0.08 1 0.17 2 0.45 3 0.25 4 0.05

asked by Donzella on February 28, 2016
36. ## elementary statistics

compute the variable of the random varible X

asked by Anonymous on April 25, 2011
37. ## statistics

a study found 37% of a new technique resulted in pregnancy and in that technique 25% resulted in multiple births what is the probabilty that the new technique produced a pregnacy and multiple births what is probability that a random selected pregnancy did

asked by jane on June 6, 2013
38. ## STATISTICS

The number of boxes of girl scout cookies sold by each of the girl scout in a city has a distribution which is approximately normal with a mean=75 boxes and a standard deviation=30 boxes.... 1.) find the probability that scout chosen at random sold between

asked by Mason on August 10, 2011
39. ## College Math

A bucket contains orange tennis balls and yellow tennis balls from which 5 balls are selected at random, but assume that the bucket contains 7 orange balls and 6 yellow balls. (1) What is the probability that, of the 5 balls selected at random, at least

asked by Sigmund on February 28, 2009
40. ## Statistics

Assume the weights of men are normally distributed having a mean of 185 lbs and a standard deviation of 17 pounds. A. Calculate the probability a randomly selected man weights less than 225 lbs B. Approximately 72% of men’s weights exceed how many

asked by Bill on March 26, 2013
41. ## Hypothesis Test

A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random

asked by Simon on November 16, 2013
42. ## Stats

A test of hypothesis is performed to determine whether the proportion of Montrealers (population 1) who want the decriminalization of marijuana is greater than the proportion of Torontonians (population 2) who want decriminalization of marijuana. A random

asked by Emile on November 17, 2013
43. ## algebra 1

1. MULTI-STEP PROBLEM There are 5743 known amphibian species in the world. Of these, 1856 species are judged to be at risk of extinction, and another 113 species may already be extinct. a. Find the probability that an amphibian species chosen at random is

asked by Ruby on May 17, 2016
44. ## statistics

Statistical Abstracts (117th edition) provides information aboutthe number of registered automobiles, including taxis, by state. The number ofregistered automobiles per 1,000 residents follows an approximately normaldistribution with mean ì = 514.6 and

asked by Anonymous on April 19, 2012
45. ## maths

There is an auction for a house, with a List Price of \$100K. There are only two bidders, who bid randomly, one after another. Their bids are in the \$0 to \$100K range. They don’t know what the other person bid (even if they did, it wouldn’t matter cause

asked by nkm on April 12, 2013
46. ## Statistics

An opinion poll asks a random sample of 100 college seniors how they view their job prospects. In all, 53 say "Good." The 95% confidence interval has a margin of error of 9.9%. The sample used actually included 130 college seniors but 30 of the seniors

asked by Samantha on November 11, 2013
47. ## college ststistics

given x is a noramlly distributed random variable with a mean of 28 and a sd of 7 find p(x

asked by melba on June 11, 2012
48. ## math

If two people are selected at random, what is the probability that they were both born in May?

asked by CC on June 9, 2011
49. ## math

supposed that k is a random variable. given that P(-3.7

asked by A on October 7, 2015
50. ## math

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)

asked by assma on December 28, 2014
51. ## math

A random variable x has a probability distribution. How to calculate E(1/(X+1))?

asked by Mahalakshmi on August 24, 2011
52. ## Statistics

x is a random variable with the probability function: f(X) = x/6 for x = 1, 2 or 3 the expected value of X is?

asked by Shellie on October 8, 2009
53. ## math

If a student is selected at random, find the probability a)

asked by Carlos on March 25, 2007
54. ## math

If a permutation is chosen at random, what is the probability that it begins with at least 2 A's?

asked by bballer on September 26, 2012
55. ## statistical applications

when is random sampling not the best approach to sample selection?

asked by anette on March 8, 2010
56. ## statistics

A random variable x has a following probability distribution. x: 0 1 2 3 P(X=x) 1/6 1/2 1/5 2/15 How to calculate E(1/(X+1))?

asked by Mahalakshmi on August 24, 2011
57. ## Math

Can someone help please. I'm really confused. 12 + 3(2y – 3) Thank you random person if you do help me! It would be really great and helpful if you do.

asked by MeowCat97 on October 19, 2015
58. ## math

3.The distribution function of a random variable is given by F(x)= {0 , for x

asked by Rami on August 20, 2014
59. ## math

Let x1,x2,x3 be random sample of normal(6,4)(x+1)/2,-1

asked by assma on December 28, 2014
60. ## statistics

Z is a standard normal random variate. For Pr(c < Z) = 0.278, what is the value for c?

asked by lisa on May 18, 2016
61. ## math

Let x1,x2,x3 be random sample of normal(6,4), find P(max{x1,x2,x3}>8)

asked by assma on December 28, 2014
62. ## probability

The joint PMF, p X , Y ( x , y ) , of the random variables X and Y is given by the following table: y = 1 4 c 0 2 c 8 c y = 0 3 c 2 c 0 2 c y = − 1 2 c 0 c 4 c x = − 2 x = − 1 x = 0 x = 1

asked by Anonymous on October 2, 2018
63. ## statistics

the random variable x is known to be uniformly distributed between 70 and 90. the probability of x having a value between 80 to 95 is

asked by Anonymous on December 6, 2011
64. ## math

Let x be the standard normal random variable. find the following: a)P(0)

asked by vilma on October 26, 2012
65. ## Maths

The distribution function of a random variable is given by F(x)= {0 , for x

asked by Rami on August 20, 2014
66. ## Algebra

This question was just some random one on a math sheet. There were no directions, and I"m not sure what to do. 5(x-3)=? Thanks!

asked by Student on June 6, 2009
67. ## math

What is the probability that one selected at random will read between -1.2 and 1.3 knots?

asked by Cindy on October 12, 2011
68. ## stats

Let z be a random variable with a standard normal distribution, P(-1.9

asked by Clay on July 24, 2010
69. ## maths

what is the probability of picking Friday at random? (likely/impossible)

asked by Anonymous on October 26, 2015
70. ## analysis

What is meant by the sample space for a random experiment?

asked by Kasey on May 17, 2012
71. ## math

A random variable x has a following probability distribution. x: 0 1 2 3 P(X=x): 1/6 1/2 1/5 2/15 How to calculate E(1/(X+1))?

asked by Mahalakshmi on August 24, 2011
72. ## algebra

What is the probability that a month picked at random will have 31 days? A.5/12 B.4/12 C.7/12 D.8/12 I think it is C...?

asked by Cassie on March 18, 2013
73. ## Math

6. Biased coin Bookmark this page Problem 5. Biased coin 5.0 points possible (graded, results hidden) We are given a biased coin, where the probability of Heads is q. The bias q is itself the realization of a random variable Q which is uniformly

asked by YuLin on December 18, 2018
74. ## Math - Statistics

Suppose that the mean number of customers who arrive at the check-out counters each minute is 4. Create a Poisson Distribution with u (lamda) = 4 for x = 0 to 20. Compare your results to the histogram. 20 random numbers are generated with a Poisson

asked by J on December 6, 2007
75. ## statistics

A specific study found that the average number of doctor visits per year for people over 55 is 8 with a standard deviation of 2. Assume that the variable is normally distributed. 1. Identify the population mean. The population mean is 8. 2. Identify the

asked by Cameron on June 3, 2013
76. ## Alegebra

Can some one please help me with this 3 problems I have a hard time with probabilities I'm studying for my mid-term. Thank you 1) Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a

asked by Jessi on September 11, 2009
77. ## probability

The vertical coordinate (“height") of an object in free fall is described by an equation of the form x(t)=θ0+θ1t+θ2t2, where θ0, θ1, and θ2 are some parameters and t stands for time. At certain times t1,…,tn, we make noisy observations Y1,…,Yn,

asked by A on April 2, 2014
78. ## statistics

Suppose that large dogs weights are normally distributed with a mean of 100 pounds and a standard deviation of 10 pounds. If one of these dogs is picked random: a) what is the probability that the dog will weigh over 110 pounds? b) what is the probability

asked by Anonymous on March 26, 2010
79. ## statistics

A random sample of 150 investment bankers (population 1) had thirty percent who expressed dissatisfaction with their choice of career. A random sample of 200 financial analysts (population 2) had forty-two percent who expressed dissatisfaction. In testing

asked by Anonymous on March 27, 2015
80. ## Maths A

Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 inclusive. o The next ten (10) numbers must lie in the range from 30 to 70 inclusive. o The remaining eight (8) numbers must lie in

asked by Anna on February 25, 2013
81. ## stata

What is the probability that a person selected at random from data will be male?

asked by shiela on October 23, 2010
82. ## School

What are some secret random acts of Kindness??? Like something where you do something nice for someone, but they don't know who it is...

asked by Anonymous on October 16, 2007
83. ## Statistics

If I choose 5 cards at random, how many ways are there to get a full house?

asked by Tammie on February 2, 2014
84. ## science

how do you find the power when they give you random weird information

asked by alice on April 23, 2010
85. ## Probability

A random variable N has a cumulative distribution function given by F(x)={ 0 for x

asked by Julie on February 1, 2009
86. ## Statistics

Use this information to calculate the mean and standard deviation of this random variable. P(x)- .25, .05, .55, .15

asked by Bill on March 26, 2013
87. ## Probability

The random variable is uniform in the (-2c,2c)interval . Find and sketch F(y) and f(y) if Y=X^2

asked by Anonymous on October 13, 2011

Assume that X is a binomial random variable with n = 5 and p = 0.35. Calculate the following probabilities?

asked by Alicia on November 14, 2012
89. ## Probability

A random variable N has a cumulative distribution function given by F(x)={ 0 for x

asked by Julie on February 1, 2009
90. ## statistics

If the random variable z is the standard normal score and a > 0, is it true that P(z > -a) = P(z < a)? Why or why not?

asked by tina on November 26, 2011
91. ## stat

When rolling a die, is this an example of a discrete or continuous random variable?

asked by Bruce on June 17, 2013
92. ## Math

X is a normally distributed random variable with a mean of 8.00. If the probability that X is less than 9.54 is 0.67, then what is the standard deviation of X?

asked by Elizabeth on April 2, 2016
93. ## math

Page 9 of 9 What is the probability that a point chosen at random on segment PQ will be between -1 and 3? -5 through 5

asked by sha on April 1, 2011
94. ## statistics

from a group of six people two individuals are to be selected at random. How many possible selections are there?

asked by maria on January 8, 2011
95. ## math

Find the probability between 42 and 48 speeders in a random sample of 100

asked by john jones on May 2, 2013
96. ## statistics

Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1+X)·E(1+X)·E(1/1+X)=1. n→∞

asked by Jeremy on November 15, 2014
97. ## Stats

let x be a binomial random variable with expected valuee 4 and variance 2 a) What is P(X=3)? b) What is P(X

asked by john on April 26, 2017
98. ## probability April-005

X is a random variable following binomial distribution with mean 2.4 and variance 1.44 find

asked by probability on April 18, 2013
99. ## math

a student chosen at random failed a driving test.

asked by terry on March 13, 2010
100. ## Maths

A dice is thrown at random. Find the probability of getting a number less than 3

asked by Vanshika on March 5, 2017