A number is chosen at random from 40 and 50 inclusive. Find the probability that
MATHEMATICS
WAEC 2023
A number is chosen at random from 40 and 50 inclusive. Find the probability that the number is prime.
- A. \(\frac{8}{11}\)
- B. \(\frac{3}{11}\)
- C. \(\frac{4}{11}\)
- D. \(\frac{5}{11}\)
Correct Answer: B. \(\frac{3}{11}\)
Explanation
Total numbers from 40 to 50inclusive = 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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