Find the value of W:
Since the sum of all probabilities in a probability distribution must equal 1, we can set up the following equation to find the value of W:
$0.15 + 0.20 + 0.45 + W = 1$
Solving for W, we get:
$W = 1 - 0.15 - 0.20 - 0.45$
$W = 0.20$
So,
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