Question: 7. (10 points) Let E be the sample mean. Show the following statements: (i) 21:1 (xi E) = 0; N . 2 _ _ _

7. (10 points) Let E be the sample mean. Show the

7. (10 points) Let E be the sample mean. Show the following statements: (i) 21:1 (xi E) = 0; N . 2 _ _ _ _ . (ii) 02 = 4163'\" #2; (111) 21:1 (m,- 5v\") (312' - y) = 221:1 (5% 33)?)1' = L1 913(312' .11); (1V) 21:1(551' 39) (9i 37) = L1 WM \"5377; (V) 221:1(331' if = 21:1 35:2 _ \"392

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