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need help with this 3. The length of time Y necessary to complete a a key operation in the construction of houses has an exponential

need help with this

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3. The length of time Y necessary to complete a a key operation in the construction of houses has an exponential distribution with P() > 6|Y > 4) - 0.81873. (a) Find P(Y 17). (b) The formula C - 100 +40Y + 3) gives the cost C of completing the operation. Find the mean and variance of C

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