A coin is tossed twice. Let Z denote the number of heads on the first toss and

Question:

A coin is tossed twice. Let Z denote the number of heads on the first toss and W the total number of heads on the 2 tosses. If the coin is unbalanced and a head has a 40% chance of occurring, find
(a) The joint probability of W and Z;
(b) The marginal of W;
(c) The marginal of Z;
(d) The probability that at least 1 head occurs.
Distribution
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