CMA Foundation · Fundamentals of Business Mathematics and Statistics · Probability
Of 200 customers at a Chennai store, 120 bought rice, 90 bought dal and 40 bought both. What is the probability that a randomly chosen customer bought neither rice nor dal?
The probability is 0.15. Customers buying rice or dal number 120 + 90 - 40 = 170 out of 200, which is 0.85. The complement, buying neither product, is 1 - 0.85 = 0.15.
- A0.15Correct
- B0.35
- C0.25
- D0.30
Explanation
Customers buying rice or dal = 120 + 90 - 40 = 170. Probability of at least one = 170/200 = 0.85. Neither = 1 - 0.85 = 0.15. The option 0.35 arises from not subtracting the overlap properly (1 - 210/200 is invalid) or other errors.
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