Assume that the cost of an engine repair is $50, and the cost of a transmission repair is $100. Let T represent the total cost of repairs during a one-hour time interval.
a. Find 
b. Find 
c. Find P(T=250).
(a)
(b)
(c) P(T = 250) = P(X = 1 and Y = 2) + P(X = 3 and Y = 1) = 0.08 + 0.02 = 0.10
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