Question: 3. (10 pts) Let X ~N(50, 64) be a normal random variable. Find c such that P(X-50| c) = 0.80. 4. (10 pts) The

3. (10 pts) Let X ~N(50, 64) be a normal random variable.

3. (10 pts) Let X ~N(50, 64) be a normal random variable. Find c such that P(X-50| c) = 0.80. 4. (10 pts) The time to repair a car is an exponentially distributed random variable with parameter 04. That is, the repair time, X Exp(1/4). If the repair time exceeds 6 hours what is the probability that it exceeds 9 hours?

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