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A waitress believes the distribution of her tips has a model that is slightly skewed to...

A waitress believes the distribution of her tips has a model that is slightly skewed to the right​, with a mean of ​$10.80 and a standard deviation of ​$5.40. She usually waits on about 60 parties over a weekend of work. ​

a) Estimate the probability that she will earn at least ​$750. ​

b) How much does she earn on the best 10​% of such​ weekends?

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