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OAU Post-UTME Mathematics 2023 Question 1

Question 1

Probability

The table shows the outcome when a die is thrown a number of times.
Score: 1, 2, 3, 4, 5, 6
Frequency: 25, 30, 45, Y, 40, 32
If the probability of obtaining a 3 is 0.225. How many times was the die thrown?

  1. A.172
  2. B.45
  3. C.200
  4. D.155
Show the answer and explanation

Answer: C (200)

Explanation

P(3) = 45 ÷ total throws = 0.225, so total = 45 ÷ 0.225 = 200 throws.