More tips 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...

More tips 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

Tips A waiter believes the distribution 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.

 a) Explain why you cannot determine the probability that a given party will tip him at least $20.

 b) Can you estimate the probability that the next 4 parties will tip an average of at least $15? Explain.

 c) Is it likely that his 10 parties today will tip an average of at least $15? Explain.