According to government study among adults in 25- to 34-year age group, the mean amount spent for each year on reading and entertainment is $1,925. Suppose that the distribution of amounts spent follows the normal distribution with standard deviation of $610.
(a) What percent of the adults spend more than $2,725 per year on reading and entertainment?
(b) What percent spend between $2,725 and $3,125 per year on reading and entertainment?
(c) What percent spend less than $1,300 per year on reading and entertainment?