A waitress believes the distribution of her tips has a model that is slightly skewed to the right​, with a mean of ​$9.10 and a standard deviation of ​$6.30. She usually waits on about 50 parties over a weekend of work. ​a) Estimate the probability that she will earn at least ​$600. ​b) How much does she earn on the best 5​% of such​ weekends?   a) P(tips from 50 parties>​$600​)=enter your response here ​b) The total amount that she earns on the best 5​% of such weekends is at least ​$ ?

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