Pre Algebra

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Extracted Text:
Question: (4) Flip a fair coin 30 times. Let x be the number of heads in the first 20 flips and Y the number of heads in the last 20 flips. Calculate Cov(x,Y). (4) Flip a fair coin 30 times. Let x be the number of heads in the first 20 flips and Y the number of heads in the last 20 flips. Calculate Cov(x, y).