Refer to Exercise 6.12.
a. Find E (Y - 10).
b. Find E(3Y).

Data from Exercise 6.12

The Department of Transportation (DOT) monitors sealed bids for new road construction. For new access roads in a certain state, let X =  low bid (thousands of dollars) and let Y = DOT estimate of fair cost of building the road (thousands of dollars). The joint probability density of X and Y is

Transcribed Image Text:

e-y/10 f(x, y) 0 < y < x< 2y 10y