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| rev | Admin | (Created page with "'''Solution: E''' Let <math>X_k</math> be the random change in month <math>k</math>. Then <math>\operatorname{E}(X_k) = (0.5)(1.1) + 0.5(−0.9) = 0.1</math> and <math>\opera...") | May 7'23 at 2:44 | +596 |