Question

the probability of a student's getting A,B,C and D grade are 0.35,0.25,0.15 and 0.5 respectively. find the probability of getting
1)atmost C grade
2) at least B grade

Answer 1

Given Probability that students getting A grade = 0.35.

           Probability that students getting B grade = 0.25

           Probability that students getting C grade = 0.15

           Probability that students getting D grade = 0.5.


(1) The Probability that getting Atmost C grade

= P(C) + P(D)

= 0.15 + 0.5

= 0.65.

Therefore the required probability = 0.65.



(2) The probability of getting At least B grade:

P(B) + P(A)

= 0.25 + 0.35

= 0.6.

Therefore the required probability = 0.6.


Hope this helps!