Exhibit 5-10.According to a study by the Centers for Disease Control and Prevention,about 33% of U.S.births are Caesarean deliveries (National Vital Statistics Report,Volume 60,Number 2,November 2011).Suppose seven expectant mothers are randomly selected. Refer to Exhibit 5-10.What is the probability that at least 1 of the expectant mothers will have a Caesarean delivery?
A)0.0606
B)0.2090
C)0.9394
D)0.9742

Question

Quizplus · Accepted Answer

The probability that none of the seven expectant mothers will have a Caesarean delivery is (0.67)^7 = 0.0606. Therefore, the probability that at least one of them will have a Caesarean delivery is 1 - 0.0606 = 0.9394.