tinnitus find the mean and standard deviation for the random

tinnitus find the mean and standard deviation for the random variable x. Use the range rule of thumb to identify the range of usual values for the number of males with tinnitus among four ramdomly selected males. Is it unusual to get three males with tinnitus among four randomly selected males?

Is it unusual to get three males with tinnitus among four randomly selected males?

it is unusula because the probability is almost 0.000