A waitress believes the distribution of her tips has a model that is slightly skewed to the left​, with a mean of ​$8.80 and a standard deviation of ​$6.50. She usually waits on about 60 parties over a weekend of work. ​a) Estimate the probability that she will earn at least ​$550. ​b) How much does sheearn on the best 10​% of such​ weekends?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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A waitress
believes the distribution of her tips has a model that is slightly skewed to the
left​, with a mean of ​$8.80 and a standard deviation of ​$6.50.
She usually waits on about 60 parties over a weekend of work.
​a) Estimate the probability that she will earn at least ​$550.
​b) How much does sheearn on the best 10​% of such​ weekends?
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