Among Coffee drinkers, men drank a mean of 3.2 cups per day with a standard deviation of 0.8 cups . Assume the number of coffee drinks per day follows a normal distribution.
a. what proportion drinks 2 cups per day or more?
b. What proportion drank no more than 4 cups per day?
c. if the top 5% of coffee drinkers are considered heavy coffee drinkers , what is the minimum number of cups consumed by a heavy coffee drinker? (Hint: find the 95th percentile)