A quarter is bent so that the probabilities of heads and tails are 0.40 and 0.60. If

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A quarter is bent so that the probabilities of heads and tails are 0.40 and 0.60. If it is tossed twice, what is the covariance of Z, the number of heads obtained on the first toss, and W, the total number of heads obtained in the two tosses of the coin?
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