A

waitress

believes the distribution of

her

tips has a model that is slightly skewed to the

left

,

with a mean of

$8.6

0

and a standard deviation of

$5.8

0.

She

usually waits on about

40

parties over a weekend of work.

a) Estimate the probability that

she

will earn at least

$450

.

b) How much does

she

earn on the best

1

%

of such weekends?