:8. Solution.  A height of 65 inches is (65 - 68)/3 = -1 in
standard units, so represents a height of 1 SD below average. 
The average of the weights of those who are 65 inches tall is
0.6 x 1 = .6 SD's below average, or .6 x 20 = 12 pounds below
average.  Thus the answer is 120 - 12 = 108 pounds.