Why do we measure things out of five? Like, 5 star hotels or restaurants? Why is it five and not, say, 37?
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A couple reasons:
1. The vast majority of the world is comfortable with counting with 5s and 10s, because that matches the number of fingers on our hands. We intuitively grasp the value at a glance compared to some other arbitrary measure.
2. Five possible rankings offers an easy breakdown for what is being measured. 5 is perfect/near-perfect, 4 good, 3 average, 2 sub-par, and 1 terrible. Other numbers tend to lead to meaningless degrees of separation – what’s the difference between a 36 and a 37, for example?
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