Q. 2

A company manufactures scooters at two plants, A and B. plant A produces 80% and plant B produces 20% of the total product. 85% of the scooters produced at pant A and 65% of the scooters produced at plant B are of standard quality. A scooter produced by the company is selected at random, and it is found to be of standard quality. What is the probability that it was manufactured at

plant A?

Answer :

Let S : Standard quality


We want to find P(A|S), i.e. probability that selected standard scooter is from


plant A



Where, P(A) = probability that scooter is from A


P(B) = probability that scooter is from B


P(S|A) = probability that standard scooter from A


P(S|B) = probability that standard scooter from B




Conclusion: Therefore, the probability of selected standard scooter is from plant A is


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