The glasses that Pierre wants to buy cost $230. If he waits for them to go on sale next week, he can get a 15% discount. How muc
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Let be the total amount of money paid by any given set of passengers. If there are
passengers in a car, then the driver must pay a toll of
.
Then has first moment (equal to the mean)
and second moment
Recall that the variance is the difference between the first two moments: