Find the z scores that separate the middle
Find the z scores that separate the middle 48% of the distribution from the area in the tails of the standard normal distribution
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Suppose that the proportions of blood phenotypes in a particular population are as follows:
According to the National Institute on Alcohol Abuse and Alcoholism (NIAAA), and the National Institutes of Health (NIH), 41% of college students nationwide engage in "binge drinking" behavior, having 5 or more drinks in one occasion during the pa
Find the probabability a value will be less than 1.65 standard deviations above the mean
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A random sample of students was weighed after their first week of their first semester and weighed again after their final week of their first semester. Is there strong evidence that the students gained weight during their first semester? The summ
However, of the products that were not successful, 20 percent of the time market research was used. If market research is performed for a new product, what is the probability that the product is actually successful?
Suppose X has a geometric distribution with success probability 1/4; that is, P(X=k) = (3/4)^k-1(1/4). Find all the medians of X.
Suppose each of n balls labeled 1 to n is placed in one of n boxes labeled 1 to n. Assume the n placements are made independently and uniformly at random (so each box can contain more than one ball). A match occurs at place k if ball number k fall
The Public Library has a board of directors consisting of 6 women and 4 men. A 3-member committee from the board is to conduct a search for a new head librarian.
If 2,000 customers will pass the display on the day of the sale, and if a one-item-per-customer limit is placed on the sale item, how many units of the sale item should the store stock in order to have at most a 1 percent chance of running short o
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