In a recent year, about 2/3 of US houiseholds purchased group coffee. Consider the annual ground coffee expenditures for househols purchasing grud coffee assuming that these expenditures are approximately disributed as a normal random vriable with a mean of $45.16 and a standard deviaiton of $10.00.
a) What I the probability that a houehold spent les than $25.00?
b) What is the probabiliry that a household spent between $30.00 and $40.00?
c) What is the probabiliyt that a household spent more than $50.00?
d) 99% of the houeholds spent less than what amount?