Q. 234.3( 3 Votes )

For A,B and

Answer :

Let us assume U1, U2, U3 and A be the events as follows:


U1 = choosing Firm A


U2 = choosing Firm B


U3 = choosing Firm C


A = A change takes place


From the problem





P(A|U1) = P(Change occurs due to firm A)



P(A|U2) = P(Change occurs due to Firm B)



P(A|U3) = P(Change occurs due to firm C)



Now we find


P(U2|A) + P(U3|A) = P(The change occurred due to appointing B or C)


Using Baye’s theorem:







The required probability is .


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