Normal distribution

High fructose corn syrup is a sweeter in food products that is linked to obesity and type-II diabetes. The mean annual consumption in United States in 2008 of HFCS was 60 lbs with a standard deviation of 20 lbs. assume the population follows a normal distribution.

a. Find the probability a randomly selected American consumes more that 50 lbs of HFCS 

per year.

b. Find the probability a randomly selected American consumes between 30 & 90 lbs of HFCS per year.