A contour map is shown for a function f on the square R = [0, 8] x [0, 8]. 8 y 10 50 60 70 50 60 4 8 (a) Use the Midpoint Rule with m n 2 to estimate the value of SSR' f(x, y) dA. (Round your answer to the nearest integer.) (b) Estimate the average value of f. (Round your answer to one decimal place.)

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