The mathematical rule of three can be used to take probabilities. In the exposed example, the approximate probability of a moth being black is 35% (Option D).
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Available data:
- 47 moths are brown
- 15 moths are yellow
- 34 moths are black
The total number of individuals in this population equals the addition of brown, yellow, and black individuals.
This total number of individuals equals 100% of the population.
So to get the probability of a moth being black, we can just perform a rule of three.
To do it, we need to get the percentage of black individuals in the current population.
96 moths ------------------------- 100% population
34 black moths ----------------- X= (34 x 100) / 96
                         =35.41 ≅ 35% of the population
The approximate probability of a moth being black is 35%.
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Learn more about how to get probabilities at
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