Expert answer:MA141 Grantham Week 5 Expected Value and Probabili


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1. Research the meaning of expected value. Share with us your interpretation of what it means
and how it can be useful. Explain an example of a real-life application emphasizing its
1) A combination lock will open when you select the right choice of three numbers. How many
possible lock combinations are there, assuming you can choose any number from 0 and 35?
a) Assume the numbers must be distinct.
b) Assume they may be the same.
2) Eleven sprinters qualify for the finals in the 150-meter dash at a national track meet. In how
many ways can the sprinters come in first, second, and third? (Assume there are no ties.
3) The employees of a company work in six departments: 15 are in sales, 50 are in research, 12
are in marketing, 20 are in finance, and 100 are in production. The payroll clerk loses one
employee’s paycheck. What is the probability that the employee works in the research
4) The deck for a card game contains 30 cards. 10 are red, 10 yellow, 5 blue, and 1 green, and 4
are wild cards. Each player is randomly dealt a five-card hand.
a) What is the probability that a hand will contain exactly two wild cards?
b) What is the probability that a hand will contain two wild cards, two red cards, and one blue
cards? (9.7-44)
5) A fire department keeps two rescue vehicles. The probability that a specific vehicle is
available at any given time when needed is 90%. Also, the availability of one vehicle is
independent of the availability of the other. Find:
a) The probability that neither vehicle is available at a given time
b) The probability that at least one vehicle is available at a given time.
c) The probability that both vehicles are available at a given time.

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