The Department of Transportation (DOT) monitors sealed bids for new road construction. For new access roads in a certain state, let low bid (thousands of dollars) and let estimate of fair cost of building the road (thousands of dollars). The joint probability density of X and Y is f(x, y)= e^-y/10/10y 0< y

Complete Question

The complete question is shown on the first and second uploaded image

The  marginal density function of Y is  

The distribution is exponential distribution

and the expected value is

Step-by-step explanation:

From the question we are told that the function is  

Now the marginal density function of Y i.e f(y) is mathematically evaluated by obtaining the probability density function of y as follows

The distribution of the function above is exponential distribution with a rate parameter equals to  

  The mean DOT estimate E{Y} is mathematically evaluated as

    substituting value

can you rephrase the question ? it is unclear : -)

step-by-step explanation:

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system