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| rev | Admin | (Created page with "'''Solution: A''' <math display = "block"> \operatorname{E}[(X-1)^2] = \operatorname{E}[X^2] - 2\operatorname{E}[X] + 1 = 47 </math> so <math>\operatorname{E}[X] = (61 + 1...") | May 9'23 at 0:31 | +366 |