(a) Find the variance of the ages. Round the answer to at least four decimal places. The variance of the ages is 4 Part: 1/2 Part 2 of 2 (b) Find the standard deviation of the ages. Round the answer to at least four decimal places. The standard deviation of the ages is ollowing is the probability distribution for age or a student at a certain public nign school. x 13 14 15 16 17 18 P(x) 0.09 0.22 0.25 0.28 0.14 0.02