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The sample space of equally likely outcomes for the experiment of rolling two fair dice is :
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
What is the probability that 5% of the people there are female? What is the probability that less than 90% of the people there are male? What is the expected number of females currently there?
Find the two standard scores (z) that correspond to the following. (Enter your answers from smallest to largest. Give your answers correct to two decimal places.) (a) The middle 77% of a normal dist
A sample of 27 of 172 funded projects revealed that 11 were valued at $17,300 each and 16 were valued at $20,220 each. From the sample data, estimate the total value of the funding for all the proje
Assuming a normal population distribution with a mean of 125 and a standard deviation of 25, what is the probability of obtaining the following means for groups of subjects chosen by random sampling
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.
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?
Thirty-three percent of all liquid crystal displays (LCDs) are manufactured by Samsung. What is the probability that in a collection of three independent LCD purchases, at least one is a Samsung?
The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed.
According to the National Postsecondary Student Aid Study conducted by the U.S. Department of Education in 2008, 62% of graduates from public universities had student loans.
What is the number of possible outcomes consisting of 5 males being colorblind? How many women on average do you expect to be colorblind?
Three coins are tossed. Let X be the number of heads obtained. The probability distribution for X if given: X 0 1 2 3. P(X=x) 1/8 3/8 3/8 1/8
A concern to public health officials is whether a concentration of lead in the paint of older homes may have an effect on the muscular development of young children
To evaluate the success of a 1-year experimental program designed to increase the mathematical achievement of underprivileged high school seniors, a random sample of participants in the program will
A study was conducted of 90 adult male patients following a new treatment for congestive heart failure. One of the variables measured on the patients was the increase in exercise capacity (in m