Question

The probability of a student getting ranks 1,2,3,4 are 0.2,0.3,0.15,0.35 respectively then find the probability that a student gets atleast 3 rank.​

Answer 1

ANSWER: P(A)=0.2; P(B)=0.3; P(C)=0.15; P(D)=0.35;

At least grade C means, the student can get either A, B, or C.

So P(AUBUC)=P(A)+P(B)+P(C)=0.2+0.3+0.15=0.65.

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