The waiter in Exercise 13 usually waits on about 40 parties over a weekend of work. a)

Question:

The waiter in Exercise 13 usually waits on about 40 parties over a weekend of work.
a) Estimate the probability that he will earn at least $500 in tips.
b) How much does he earn on the best 10% of such weekends?
Exercise 13
A waiter believes the of his tips has a model that is slightly skewed to the right, with a mean of $9.60 and a standard deviation of $5.40.
Distribution
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