Mathematics
WAEC 1988
The surnames of 40 children in a class arranged in alphabetical order. 16 of the surnames begins with O and 9 of the surname begins with A, 14, of the letters of the alphabet do not appear as the first letter of a surname
What is the probability that the surname of a child picked at random from the class begins with either O or A?
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A.
5/8
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B.
7/8
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C.
9/16
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D.
14/25
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E.
39/40
Correct Answer: Option A
Explanation
No. of possible outcome = 40
No. of expected outcome = 16 + 9 = 25
Probability = 25/40 = 5/8
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