A grocery​ store's receipts show that Sunday customer purchases have a skewed distribution with a mean of ​$28 and a standard deviation of ​$21. Suppose the store had 316 customers this Sunday. ​a) Estimate the probability that the​ store's revenues were at least ​$8,900. ​b) If, on a typical​ Sunday, the store serves 316 ​customers, how much does the store take in on the worst 1​% of such​ days?

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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A grocery​ store's receipts show that Sunday customer purchases have a skewed distribution with a mean of
​$28 and a standard deviation of ​$21. Suppose the store had 316 customers this Sunday.
​a) Estimate the probability that the​ store's revenues were at least ​$8,900.
​b) If, on a typical​ Sunday, the store serves 316 ​customers, how much does the store take in on the worst 1​% of such​ days?
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