52. According to a government study among adults in the 25- to 34-year age group, the
mean amount spent per year on reading and entertainment is $1,994. Assume that the
distribution of the amounts spent follows the normal distribution with a standard deviation
of $450.
a. What percent of the adults spend more than $2,500 per year on reading and
entertainment?
b. What percent spend between $2,500 and $3,000 per year on reading and
entertainment?
c. What percent spend less than $1,000 per year on reading and entertainment?
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