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 $1,875. Assume that the distribution of the amounts spent follows the normal distribution with a standard deviation of $640. (Round z-score computation to 2 decimal places and your final answers to 2 decimal places.)

a.	What percent of the adults spend more than $2,775 per year on reading and entertainment?

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b.	What percent spend between $2,775 and $3,175 per year on reading and entertainment?

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c.	What percent spend less than $1,075 per year on reading and entertainment?

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