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Posted by on Thursday, March 10, 2011 at 1:44am.

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 ___________

  • maths - , Thursday, March 10, 2011 at 2:37am

    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 = ?

  • maths - , Monday, March 16, 2015 at 4:41am

    Hj

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