Refer to Exercise 4. Assume that the cost of repairing an assembly whose clearance is too little is $2, and the cost of repairing an assembly whose clearance is too much is $3.
a. Express the total cost of repairs in terms of X and Y.
b. Find the mean of the total cost of repairs.
c. Find the standard deviation of the total cost of repairs.
(a) 2X + 3Y
(b) 
(c) 
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