The annual ground coffee expenditures for households are approximately normally distributed with a mean of $42.75 and

Question:

The annual ground coffee expenditures for households are approximately normally distributed with a mean of $42.75 and a standard deviation of $11.00.
(a) Find the probability that a household spent less than 20.00.
(b) Find the probability that a household spent more than 60.00.
(c) What proportion of the households spent between 30.00 and 40.00?
(d) 99.5% of the households spent less than what amount?