6.12 In 2017, the per capita consumption of soft drinks in the United States was reported to be 37.5 gallons. Assume that the per capita consumption of soft drinks in the United States is approximately normally distributed with a mean of 37.5 gallons and a standard deviation of 8 gallons.

a. What is the probability that someone in the United States consumed more than 50 gallons in 2017?

b. What is the probability that someone in the United States consumed between 25 and 40 gallons in 2017?

c. What is the probability that someone in the United States consumed less than 10 gallons in 2017?

d. Ninety-nine percent of the people in the United States consumed less than how many gallons of soft drinks in 2017?