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 standard deviation of the number of mothers who will have a Caesarean delivery?
A)1.24
B)1.54
C)2.31
D)4.69

Question

Quizplus · Accepted Answer

The standard deviation for a binomial distribution is calculated using the formula: √(n * p * (1-p)), where n is the number of trials (7 mothers), and p is the probability of success (0.33 for Caesarean deliveries). Plugging in the values gives √(7 * 0.33 * 0.67) ≈ 1.24.