Question

50 students in a class were given a test containing 5 questions. The number of students who answered different number of questions are given. Number of questionsFrequency03162831541652 (i) Find the probability of picking a student who answered all five questions; (ii) Find the probability of picking a student who answered not less than three; (iii) Find the probability of picking a student who answered none of the questions. [3 MARKS]

Solution

Concept: 1.5 Marks Solution: 0.5 Mark each Probability of picking a student who answered all five =250  = 0.04 Probability of picking a student who answered not less than three = (2+16+15)50 = 3350 = 0.66 Probability of picking a student who answered none = 350 = 0.06

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