Find expected value and standard error for the difference, Basic Statistics

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Find expected value and standard error for the difference

the difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
(i) heads, tails (ii) -1, 1 (iii) -1, 0 (iv) 0, 1 (v) -1, 0, 1
b) find the expected value and standard error for the difference.

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Basic Statistics: Find expected value and standard error for the difference

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