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The answer is 12, can you teach me how to get it? Thanks Given that Xi ~ N(u = 25, 0- = 9) for i=

The answer is 12, can you teach me how to get it? Thanks

Given that Xi ~ N(u = 25, 0- = 9) for i= 1, 2, 3, .., 72, what is the value of standard deviation of 2 0 = EM X-25 3 ? Give your answer as an integer

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