3. Last year, the numbers of calculators produced per day at a certain factory were normally distributed with a mean of 560 calculators and a standard deviation of 12 calculators. (a) On what percent of the days last year did the factory produce 572 calculators or fewer?

(b) On what percent of the days last year did the factory produce 584 calculators or more?

(c) On what percent of the days last year did the factory produce 548 calculators or fewer?
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