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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:
  1. 0.65
  2. 0.15
  3. 0.5
  4. 0.35


Solution

The correct option is A 0.65

Probability that a student gets atleast 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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