The annual ground coffee expenditures for households are approximately normally distributed with a mean of $ 46.64 and a standard deviation of $ 11.00
a. Find the probability that a household spent less than $30.00.
b. Find the probability that a household spent more than ​$60.00.
c. What proportion of the households spent between​$20.00 and ​$30​.00?
d.97.5​% of the households spent less than what​ amount