Two events are independent when neither depends on the other. That is, the probability that one occurs is not affected by the occurrence, or lack of occurrence, of the other event. Their joint probability is the product of their individual probabilities.
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Among the answer choices, all describe two independent events except C. Choice C describes one (1) event, so does NOT illustrate independent events.
As the graph approach negative infinity the graph move to positive infinity as the graph approach positive infinity the graph move to negative infinity