A fair coin is tossed once. Which number on the probability scale marks the chance of it landing on heads? Give the probability as a fraction in its simplest form.

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Heads and tails are equally likely, so heads happens as often as it fails and its place is exactly halfway along the scale from 0 to 1, which is written as one half. Answering 1/1 puts heads at the top of the scale, the place kept for an event that happens every time, and the coin fails to show heads on half its tosses; answering 2 reports how many results the coin has rather than where the chance of one of them sits, and no point on the scale lies beyond 1.