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Suppose a cell phone plan costs 20 dollars per month for 30 minutes of use and each additional minute costs .5 dollars. If the number
Suppose a cell phone plan costs 20 dollars per month for 30 minutes of use and
each additional minute costs .5 dollars. If the number of minutes you use in a month is a
geometric random variable M with E[M] = 30, what is the PMF of C, the cost of the phone
for one month? What is E[C]?
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