A recent survey reported that 22 of adults 55 and over own

A recent survey reported that 22 % of adults 55 and over own a smart phone. Using the binomial distribution...?

D. What are the mean and standard deviation of the number of adults 55 and older who will own a smartphone in a survey of six?

use an excel function please.

Solution

d)

We don\'t need special functions here, we just have to follow formulas.

As

mean = n p = 6*0.22 = 1.32 [answer]

standard deviation = sqrt[n p (1-p)] = sqrt(6*0.22*(1-0.22)) = 1.014692072 [answer]