Lesson: Applied Arithmetic - 25t01

Probability In-Format

[Page 25 of 36]
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In a colony of 1,500 lemmings, exactly 30 lemmings are variegated. If one lemming is chosen at random from the colony, what is the probability that it is not variegated?

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There are 1,500 lemmings and only 30 of them are variegated. That means that nearly all the lemmings are not variegated. So the probability of picking a non-variegated lemming is very high.

The first three probabilities are small, so you can eliminate them right off. Here it might be easier to calculate the probability that a lemming is variegated, and subtract that from 1 to find the probability that a lemming is not variegated. So, the probability that a lemming is variegated is:

.

And that makes the probability that a lemming is not variegated .

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