Math 140 Test 2
Are the commercials working?
Identification Tags How many different 3-digit
identification tags can be made if the digits can be used
more than once? If the first digit must be a 5 and
repetitions are not permitted?
A supervisor in a manufacturing plant has four men and three women working for him. He wants to choose two workers for a special job. Not wishing to show any biases in his selection, he decides to select the two workers at random. Let Y denote
the number of women in his selection.
What is the sample space of Y?
What are the values of the random variable y?
What is the probability function of y?
Make a probability distribution table for y.
Using the above calculate E(y).
Using the above table calculate Var(y)
People Who Have Some College Education
Fifty-three percent of all persons in the U.S. population have at least some college education. Choose 10 persons at random.
Find the probability that exactly one-half have some college education.
Check to see if the above value is the maximum value for p(x).
What is the expected number of people with some college education?
What is the variance of the number of people with some college education?
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