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The mean of normal probability distribution is 60; the standard deviation is 5.
a. About what percent of the observations lie between 55 and 65?
b. About what percent of the observations lie between 50 and 70?
c. About what percent of the observations lie between 45 and 75?

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The answer to the normal probability distribution is given in the solution.

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a)
P(55<x< 65) = P( 55-60 /5 <Z < 65- 60 /5)
= P( -1 < Z < 1)
= ...

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