CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

Question : 28 of 29

Marks: +1, -0

A manufacturer has three machine operators A, B and C. The first operator A produces

1 \%

of defective items, whereas the other two operators

{\B}

and

{\C}

produces

5 \%

and

7 \%

defective items respectively. A is on the job for

50 \%

of the time, B on the job

30 \%

of the time and

{\C}

on the job for

20 \%

of the time. All the items are put into one stockpile and then one item is chosen at random from this and is found to be defective. What is the probability that it was produced by A ?

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