What is the pmf of c the cost of the phone for one month

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Suppose that a cellular phone costs $20 per month with 30 minutes of use included and that each additional minute of use costs $0.50. If the number of minutes you use in a month is a geometric random variable M with expected value of E[M] = 1/p = 30 minutes, what is the PMF of C, the cost of the phone for one month?

Reference no: EM131081920

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