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The probabilities 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

1) At least C grade is __________
2) At most C grade is ___________

2 answers

At least C = A, B or C

Either-or probability is found by adding individual probabilities.

At most C = F, D or C

Is there no probability of getting an F?

P(F) = 1 - .2 - .3 - .15 - .35 = ?
Waste
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