A waitresswaitress believes the distribution of herher tips has a model that is slightly skewed to the leftleft, with a mean of $ 9.39.30 and a standard deviation of $4.84.80. SheShe usually waits on about 4040 parties over a weekend of work. a) Estimate the probability that sheshe will earn at least $400400. b) How much does sheshe earn on the best 55% of such weekends?

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