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For a set of 70 coin flips, we record 21 heads and 49 tails. 1) If p is the true probability of heads, what is

For a set of 70 coin flips, we record 21 heads and 49 tails. 1) If p is the true probability of heads, what is our best estimate for p here? 2) What is our best estimate for the standard deviation

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