18% of high school boys and 10% of high school girls say they rarely or never wear seat belts. Suppose one high school boy and one high school girl are selected at random, with the random variable of interest being the number in the pair who say they rarely or never wear seat belts. Describe two ways of finding the expected value and standard deviation of this random variable, at least approximately.

Question

18% of high school boys and 10% of high school girls say they rarely or never wear seat belts.  Suppose one high school boy and one high school girl are selected at random, with the random variable of interest being the number in the pair who say they rarely or never wear seat belts.  Describe two ways of finding the expected value and standard deviation of this random variable, at least approximately.