The annual ground coffee expenditures for households are approximately normally distributed with a mean of $43.38 and a standard deviation of $13.00.

a. Find the probability that a household spent less than $30.00.

b. Find the probability that a household spent more than $50.00.

c. What proportion of the households spent between $25.00 and $35.00?

d. 90% of the households spent less than whatamount?