The probabilities that a student will receive an A, B, C or D grade are 0.30, 0.38, 0.22 and 0.01, respectively. What is the probability that the student will receive at least B grade?

0.38

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0.42

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0.68

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None of these

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Solution

The correct option is C 0.68
$P (a t l e a s t B g r a d e) = P (B g r a d e) + P (A g r a d e)$
$= 0.38 + 0.30 = 0.68$

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