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# CBSE Class 12-science Answered

Neelam has offered physics , chemistry and mathematic sin class XII. She estimates that her probabilities of receiving a grade A  in these course are 0.2 , 0.3 and 0.9  respectively . Fins the probability that neelam receives : exactly 2A grades
Asked by haroonrashidgkp | 05 Nov, 2018, 02:11: PM
Let P represent A grade in physics, C represents A grade in chemistry and M represent A grade in Maths.
According to the question,
P(P) = 0.2, P(C) = 0.3, P(M) = 0.9, P(P') = 0.8, P(C') = 0.7 and P(M') = 0.1
Required probability has three cases :
i) P(A grade in P and C but not in M) = 0.2 × 0.3 × 0.1
ii) P(A grade in C and M but not in P) = 0.3 × 0.9 × 0.8
iii) P(A grade in M and P but not in C) = 0.9 × 0.2 × 0.7
Required probability is sum of i), ii) and iii)

Answered by Sneha shidid | 13 Nov, 2018, 05:22: PM

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