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The monthly utility bills in a city are normally distributed, with a mean of $100 and a standard deviation of $13. Find the probability that

The monthly utility bills in a city are normally distributed, with a mean of

$100

and a standard deviation of

$13.

Find the probability that a randomly selected utility bill is (a) less than

$66,

(b) between

$81

and

$100,

and (c) more than

$120.

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