Mathematics

Problem

A factory has two machines

A

and

B

that produce

60\%

and

40\%

of the total output, respectively. The defect rates are

3\%

for machine

A

and

5\%

for machine

B

. Find the probability that a randomly selected item is defective. a) 0.048 b) 0.030 c) 0.038 d) 0.042