Given a normally distributed population with a mean of 75 and a variance of 625, find: (a)

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Given a normally distributed population with a mean of 75 and a variance of 625, find:

(a) Pð Þ 50 x 100

(b) P xð Þ > 90

(c) P xð Þ < 60

(d) P xð Þ 85

(e) Pð Þ 30 x 110

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