Aolve this 4 one

​Q4. The probabilities that a student will receive an A, B, C and D grade are 0.30, 0.38, 0.22 and 0.10 respectively. What is the probability that the student will receive.

     (i) at least B grade                                            (ii) at most C grade

     (iii) not an A grade                                           (iv) B or C grade

    What should be done a student getting A grade ?

Dear student

Student getting A grade 
should be awarded in order to encourage the students to get  good marks.
Note: PA+PA=1

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