12. The events X and Y are mutually exclusive. Suppose P(X) - .05 and P(M) - .02. What is the probability of either X or Y occurring? What is the probability that neither X nor Y will happen?

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Chapter8: Sequences, Series,and Probability
Section8.7: Probability
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12. The events X and Y are mutually exclusive. Suppose P(X) = .05 and P(Y) = .02. What is
the probability of either X or Y occurring? What is the probability that neither X nor Y will
happen?
13. A study of 200 advertising firms revealed their income after taxes:
Income after Taxes
Number of Firms
Under $1 million
$1 million to $20 million
$20 million or more
102
61
37
a. What is the probability an advertising firm selected at random has under $1 million in
income after taxes?
b. What is the probability an advertising firm selected at random has either an income
between $1 million and $20 million, or an income of $20 million or more? What rule
of probability was applied?
14. The chair of the board of directors says, "There is a 50 percent chance this company
will earn a profit, a 30 percent chance it will break even, and a 20 percent chance it will
lose money next quarter."
a. Use an addition rule to find the probability the company will not lose money next
quarter.
b. Use the complement rule to find the probability it will not lose money next quarter.
15. Suppose the probability you will get an A in this class is .25 and the probability you will
get a B is .50. What is the probability your grade will be above a C?
16. Two coins are tossed. If A is the event "two heads" and B is the event "two tails," are
A and B mutually exclusive? Are they complements?
17. The probabilities of the events A and B are 20 and .30, respectively. The probability that
both A and B occur is .15. What is the probability of either A or B occuring?
18. Let P(X) - 55 and P(Y) - .35. Assume the probability that they both occur is .20. What
is the probability of either X or Y occurring?
19. Suppose the two events A and B are mutually exclusive. What is the probability of their
joint occurrence?
20. A student is taking two courses, history and math. The probability the student will pass
the history course is .60, and the probability of passing the math course is .70. The prob-
ability of passing both is .50. What is the probability of passing at least one?
Transcribed Image Text:12. The events X and Y are mutually exclusive. Suppose P(X) = .05 and P(Y) = .02. What is the probability of either X or Y occurring? What is the probability that neither X nor Y will happen? 13. A study of 200 advertising firms revealed their income after taxes: Income after Taxes Number of Firms Under $1 million $1 million to $20 million $20 million or more 102 61 37 a. What is the probability an advertising firm selected at random has under $1 million in income after taxes? b. What is the probability an advertising firm selected at random has either an income between $1 million and $20 million, or an income of $20 million or more? What rule of probability was applied? 14. The chair of the board of directors says, "There is a 50 percent chance this company will earn a profit, a 30 percent chance it will break even, and a 20 percent chance it will lose money next quarter." a. Use an addition rule to find the probability the company will not lose money next quarter. b. Use the complement rule to find the probability it will not lose money next quarter. 15. Suppose the probability you will get an A in this class is .25 and the probability you will get a B is .50. What is the probability your grade will be above a C? 16. Two coins are tossed. If A is the event "two heads" and B is the event "two tails," are A and B mutually exclusive? Are they complements? 17. The probabilities of the events A and B are 20 and .30, respectively. The probability that both A and B occur is .15. What is the probability of either A or B occuring? 18. Let P(X) - 55 and P(Y) - .35. Assume the probability that they both occur is .20. What is the probability of either X or Y occurring? 19. Suppose the two events A and B are mutually exclusive. What is the probability of their joint occurrence? 20. A student is taking two courses, history and math. The probability the student will pass the history course is .60, and the probability of passing the math course is .70. The prob- ability of passing both is .50. What is the probability of passing at least one?
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