A CNBC Study in 2017 Determined Only 35% of Adults $\sigma$

Multiple Choice

A CNBC study in 2017 determined only 35% of adults have zero to only a couple of hundred dollars in a savings account. With n = 4 and p = 0.43, using the binomial probability distribution, what is the mean and the standard deviation of the population? Hint: $\sigma$ = np(1 - p)

A) 4 and 0.98 respectively
B) 1.72 and 0.9902 respectively
C) 2 and 1.74 respectively
D) 1.8 and 0.9804 respectively