Suppose t hat a cellular phone costs $30 per mont h wit h
Chapter 6, Problem 6.31(choose chapter or problem)
Suppose t hat a cellular phone costs $30 per mont h wit h 300 min.utes of use included and t hat each additional minute of use costs $0.50. The number of minutes you use t he ph one in a mont h is a n exp onential random variable T wit h wit h expected value E[T ] = 200 minutes. The telephone company charges you for exactly ho\v many minutes you use wit hout a .ny rounding of fractional minutes. Let C d enote t he cost in dollars of one mont h of service. (a) What is P [C = 30]? (b) What is t he PDF of C? ( c) \i\fhat is E [C]?
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