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Question

The probabilities of a student getting grade A, B, C, and D are 0.2, 0.3, 0.15 and 0.35 respectively. Then what is  the probability that a student gets at least a C grade?



A

0.35

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B

0.15

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C

0.50

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D

0.65

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Solution

The correct option is D

0.65


Probability that a student gets atleast a C grade = (Probability of getting grade A + Probability of getting grade B + Probability of getting grade C)
= 0.2 + 0.3 + 0.15 = 0.65


Mathematics

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