According to a survey of business executives, 78% received a pay raise when they asked for one. A random sample of four executives was selected. The probability that all four received a raised when they asked for one is------- .
A)0.127
B)0.237
C)0.370
D)0.056

Question

Quizplus · Accepted Answer

The probability that all four executives received a raise when they asked for one is calculated by multiplying the individual probabilities for each executive, assuming independence. Since 78% (or 0.78) of executives received a raise when they asked, the probability for all four is $0.78^4 = 0.370$.

According to a Survey of Business Executives, 78% Received a Pay