NumericalModerate1.5 marks
4(a)
A game of numbers has cards marked with 11, 12, 13, … 40. A card is drawn at random. Find the probability that the number on the card drawn is :
A perfect square
Topic: Probability
Previous-year question practice database
Answer
Exam answer
Cards are numbered from 11 to 40.
Total number of cards: 40 − 11 + 1 = 30
Perfect squares between 11 and 40: 16, 25, 36
Favourable outcomes = 3
Probability = 3/30 = 1/10
Answer:
1/10.
Explanation
There are 30 equally likely cards. Only 16, 25 and 36 are perfect squares, so 3 of the 30 outcomes are favourable.
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