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2. If it rains tomorrow, the probability is 0.8 that John will practice his piano lesson. If it does not rain tomorrow, there is
2. If it rains tomorrow, the probability is 0.8 that John will practice his piano lesson. If it does not rain tomorrow, there is only a 0.4 chance that John will practice. Suppose that the chance o tomorrow is 60%. What is the probability that John will practice his piano lesson? "Hint: It will help to draw a tree diagram!
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