Question

Out of 190 CDs tested, 26 are defective. Estimate the number of defective CDs in a batch of 1000.

Answer 1

Divide the number of defective by the number checked:

26/190 = 0.1368

Multiply that by 1000:

0.1368 x 1000 = 136.8

Round up to 137

Out of 1000 cd’s 137 would be defective