Question: 1. Let random variable T represent the length of a phone call conversation (inminutes), and let it be exponentially distributed with a mean time of

1. Let random variable T represent the length of a phone call conversation (inminutes), and let it be exponentially distributed with a mean time of 10 minutes (and thus = 1/10 ). You call your friend at 1:00 pm and get a busy signal.(a) (5 points) What is the probability that the line is still busy at 1:10 pm?(b) (5 points) You call at 1:15 pm and find the line still busy. At what time do you expectthe line to be free? Why?

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