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Question

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

A
0.65
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B
0.15
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C
0.5
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D
0.35
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Solution

The correct option is A (0.65)Given the probability of a student getting grade A,B,C and D are 0.2,0.3,0.15 and 0.35 respectively.Probability that a student gets at least 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

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