A waitress believes the distribution of her tips has a model that is slightly skewed to the left, with a mean of $8.20 and a standard deviation of $6.20. She usually waits on about 30 parties over a weekend of work.

a) Estimate the probability that she will earn at least $350.

b) How much does she earn on the best 5% of suchweekends?

a) P(tips from 30 parties>$350)=

nothing

a.(Round to four decimal places asneeded.)