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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 ​$9.50 and a standard deviation of ​$4.80 She usually waits on about 30 parties over a weekend of work.

​a) Estimate the probability that she will earn at least ​$300. (Round to four decimal places as​ needed.)

.b) How much does she earn on the best 5​%of such​ weekends? (Round to two decimal places as​ needed.)

Math   Statistics-And-Probability   
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