Posted by **amelie** on Sunday, April 20, 2008 at 7:09pm.

For the sheet-metal stamping machine in a certain factory, the time between failures, X1 has a mean between the failures, of 56 hours and a variance of 16 hours. The prepair time X2, has a mean time to repair of 5 hours and a variance of 4 hours.

a) If X1 and X2 are independent , find

the expected value and the variance

of Y=X1+X2, which represents one

operation-repair cycle.

b)Would you expect an operation-repair

cycle to last more than 75 hours?Why?

Work

------------------------

a) E(Y)= E(X1+X2)= EX1+EX2= 56+5=61

V(Y)= ... = 20

b) P(Y>75) = P(X1+X2 >75) =

I'm not sure where to go from here, i thought of using complement but i just got stuck.

ans: no, P(Y>75)<=0.1653

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