RK 119 43 Previous Problem University at Buffalo Problem List Next Problem Match the surfaces (a) - (f) below with the contour diagrams (1) - (6) below those. (a) Surface (a) matches contour 5 V V (b) Surface (b) matches contour 2 V (c) Surface (c) matches contour 1 (d) Surface (d) matches contour 6 V (e) Surface (e) matches contour 4 V (f) Surface (f) matches contour 3 V (4) (1) -0.25 (a) (b) (c) (d) (e) y y 2.5 0.5 1.5 1.5 1.5 y .3 0.25 OC 0.25 -0.25 (2) X 1.5 ZI (f) y 0.01 0.01 (3) ☑ X 0.01 0.01 0.2 0.2 (5) 0 x 0.5 (6) 0.25 X X 0.25 0.5

43 University at Buffalo Previous Problem Problem List Next Problem At least one of the answers above is NOT correct. The figure shows a hill with two paths, A and B. (a) What is the elevation change along each path? 400 9400 ✓ feet (b) Which path ascends more rapidly? A v (c) On which path will you probably have a better view of the surrounding countryside (assuming that trees do not block your view)? A V (d) Along which path is there more likely to be a stream? A V Note: You can earn 50% partial credit for 2-3 correct answers. Preview My Answers Submit Answers Q hulu )))) 9800' A 10000 (Click on graph to enlarge) L ^ B 0 Logged in as Luella Ya 4)

28. (a) Under what conditions do we say that two random variables X and Y are independent? (b) Demonstrate that if X and Y are independent, then it follows that E(XY) = E(X)E(Y); (e) Show by a counter example that the converse of (ii) is not necessarily true.