Suppose that Americans take an average of 15 baths or showers per month with a standard deviation of 3. Assuming that this distribution is normal, what is the probability that an American selected at random will
A. Take fewer than 10 baths or showers per month?
B. Take between 12 and 20 baths or showers per month?
C. Take more than 18 baths or showers per month?
