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A waiter believes the distribution of his tips has a model that is slightly skewed to the left with a mean of $8.5 and a

A waiter believes the distribution of his tips has a model that is slightly skewed to the left with a mean of $8.5

and a standard deviation of $6.40. He usually waits on about 60 parties over a weekend of work.

a) Estimate the probability that he will earn at least $650

b) How much does he earn on the best 10% of suchweekends?

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