The average height of U.S. men is 69 inches (5 feet 9 inches) with a standard deviation of 4 inches. What is the z-value that corresponds to the shortest 33% of men? Select one: a. -0.95 b. -0.13 c. -0.33 d. -0.44 e. 0.95 f. 0.44 g. 0.33 h. 0.13

Let X be a normal random variable with mean 12 and variance 4. Find the value of c such that P{X>c}=.10.

Let X represent the difference between the number of heads and the number of tails obtained when a coin is tossed n times.
What are the possible values of X?

Based on the Normal model N(100, 16) describing IQ scores, what percent of peoples

Consider a Poisson distribution with a mean of two occurrences per time period.
What is the expected number of occurrences in three time periods?

The probability that a shopper in a certain boutique will buy a blouse is 0.35, that she will buy a pair of pants is 0.30, and that she will buy a skirt is 0.27. The probability that she will buy both a blouse and a skirt is 0.15, the probability that she will buy both a skirt and a pair of pants is 0.19, and the probability that she will buy both a blouse and a pair of pants is 0.12. Finally, the probability that she will buy all three items is 0.08.
What is the probability that a customer selected at random will buy:
a. Exactly one of these items?
b. None of these items?

A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is 0.02. What is the probability that neither will fail?

Jenny sells "honey tea" to raise fund for homeless people. The probability of making a sale is, independently, 0.3 for each person she approaches.
a) Given that she approaches 10 people, find the probability that she will makes at most 3 sales. Interpret the value obtained.
b) What is the probability that she will makes the first sale at the fifth person she approaches?
c) What is the probability that she will makes 4 sales before the seventh person she approaches?
d) Based on Jenny's experience selling "honey tea" for the last 2 weeks, the probability that the person she approaches will buy 0,1,2 or more than 2 cups are 0.7, 0.15, 0.10 and 0.05 respectively. Jenny plans to approached 20 persons. What is the probability that 10 will not buy, will buy 1 cup, 4 will buy 2 cups and the rest will buy than 2 cups?