In a recent survey, 80% of the community favored building a police substation in their neighborhood. If 15 citizens are chosen, what is the standard deviation of the number favoring the substation?
A)1.55
B)2.40
C)0.98
D)0.55

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 (15), and p is the probability of success (0.8). Plugging in the values gives √(15 * 0.8 * 0.2) = 1.55.

In a Recent Survey, 80% of the Community Favored Building