A grocery​ store's receipts show that Sunday customer purchases have a skewed distribution with a mean of ​$29 and a standard deviation of ​$19. Suppose the store had 307 customers this Sunday. ​a) Estimate the probability that the​ store's revenues were at least ​$9,100. ​b) If, on a typical​ Sunday, the store serves 307 ​customers, how much does the store take in on the worst 10​% of such​ days?

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