HI! What is the formula to use to solve this problem in excel, specifically, please? NORM.S.INV, STANDARDIZE, NORM.DIST

"The annual per capita consumption of bottled water was 33.1 gallons. Assume that the per capita consumption of bottled water is approximately normally distributed with a mean of 33.1 and a standard deviation of 11 gallons.

a. What is the probability that someone consumed more than38gallons of bottled water?

b. What is the probability that someone consumed between30and40gallons of bottled water?

c. What is the probability that someone consumed less than30gallons of bottled water?

d.99%of people consumed less than how many gallons of bottled water?"

Thanks in advance! :-)