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?
-
5/8
- 7/8
- 9/16
- 14/25
- 39/40
The correct answer is: A
Explanation
No. of possible outcome = 40No. of expected outcome = 16 + 9 = 25
Probability = 25/40 = 5/8