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WAEC Mathematics 2023 Paper

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Question : 25

Total: 50

A number is chosen at random from 40 and 50 inclusive. Find the probability that the number is prime.

$\frac{8}{11}$
$\frac{3}{11}$
$\frac{4}{11}$
$\frac{5}{11}$

Solution:

Total numbers from 40 to 50 inclusive = 11 (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50).

Prime numbers between 40 and 50 (inclusive) are 41, 43, and 47.

There are 3 prime numbers in this range.

therefore, Pr(prime numbers) = $\frac{3}{11}$

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