Assignment 64% Resources Ly Give Up? Hint Check Answer Score: How heavy a load (in pounds) is needed to pull apart pieces of Douglas fir 4 inches long and 1.5 inches square? Suppose tha strength of pieces of wood follows a Normal distribution with standard deviation 3000 pounds. You want to estimate the me load needed to pull apart the pieces of wood to within +600 pounds with 95% confidence. How large a sample n is needed? your answer rounded up to the nearest whole number. n =