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What is the probability that a device taken at random operates? What is the expected value of the number of devices that will have to be inspected?
Let X and Y be two independent random variables, where X has a Bernoulli distribution with probability of success p = 1/2 and Y has a Bernoulli distribution with probability of success q = 1/4. Show
The population mean for Verbal IQ scores is 100, with a standard deviation of 15. Suppose a researcher takes 50 random samples, with 30 people in each sample. What is mean of the sample means?
The administration at Western is curious in determining the average GPA of its students. Previous studies have shown that the population is normally distributed with a standard deviation of 1.2. Wit
The number of cases of tetanus reported in the U.S. during a single month in 1989 has a poisson distribution with a parameter of lambda= 4.5. 1. What is the probability that exactly one case of teta
What is the probability that attendance will be 45,000 or more? What is the probability of attendance below 41,000? What is the probability of attendance between 39,500 and 46,000?
What is the critical value of z in the previous question? Report the critical value CLOSEST to your calculated z-score. (Answer to 2 decimal places.)
Suppose the average speeds of passenger trains traveling from Newark, New Jersey, to Philadelphia, Pennsylvania, are normally distributed, with a mean average speed of 88 miles per hour and a standa
According to the Internal Revenue Service, income tax returns one year averaged $1,332 in refunds for taxpayers with a standard deviation of $725. Assume that a negative refund means that the taxpa
Assume that the number of hours worked per week for those who usually work full time is normally distributed. Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is
Suppose that in one region of the country the mean amount of credit card debt per household in households having credit card debt is $15,250, with standard deviation $7,125. Find the probability tha
The sample space of equally likely outcomes for the experiment of rolling two fair dice is :
At Parkview at any given time the probability that a randomly selected student is a female is 30%. With this binomial distribution in mind, assume that there are 80 people currently at Parkview.
Find the probability that the sum is exactly 4 twice, when rolling the two dice 7 times. Find the probability that the sum is 10 for the first time, happens on the 20th roll of the two dice
How large a sample should be taken if the population mean is to be estimated with 90% confidence to within $82? The population has a standard deviation of $910.
At Parkview at any given time the probability that a randomly selected student is a female is 30%. With this binomial distribution in mind, assume that there are 80 people currently at Parkview. *Fo
Find conditional density function f(x|E) for the experiment of a number selected at random from the interval [0,1], given E, where E is the event that x > 4.
Shelia's measured glucose level one hour after a sugary drink varies according to the Normal distribution with ? = 134 mg/dl and ? = 11.1 mg/dl.
Web crawlers need to estimate the frequency of changes to Web sites to maintain a current index for Web searches. Assume that the changes to a Web site follow a Poisson process with a mean of 3.5 da
There are 40 students in an elementary statistics class. On the basis of years of experience, the instructor knows that the time needed to grade a randomly chosen first examination paper is a random
It is known that 65% of all brand A zip drives work in a satisfactory manner throughout the warranty period (are "successes"). Suppose that n = 10 drives are randomly selected. Let X&n
Find the probability distribution for x = the sum of a fair, four sided die and and fair, sixsided die. b) for x from problem 1, find the probability of having the sum be at least four. c) for x fro