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A grocery​ store's receipts show that Sunday customer purchases have a skewed distribution with a mean...

A grocery​ store's receipts show that Sunday customer purchases have a skewed distribution with a mean of $29 and a standard deviation of $20. Suppose the store had 293 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 293 customers, how much does the store take in on the worst 10​% of such​ days?

Math   Statistics-And-Probability   
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