The expected value in this case means .

In two coin flips, each flip has an expected 1/2 head, so the expected total is 1 head. Expected value describes the long-run average over many repetitions; it does not guarantee exactly 1 head in any single pair of flips. Therefore, the correct choice is “after repeated trials of flipping a coin twice, the average number of times heads will turn up is 1.”

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