72. Successive monthly sales are independent normal random variables with mean 100 and variance 100. (a) Find

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72. Successive monthly sales are independent normal random variables with mean 100 and variance 100.

(a) Find the probability that at least one of the next 5 months has sales above 115.

(b) Find the probability that the total number of sales over the next 5 months exceeds 530.

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