Question

A quality control technician checked a sample of 30 bulbs. Two of the bulbs were defective. If the sample was representative, find the number of bulbs expected to be defective in a case of 450.

36
45
30
24

Answer 1

if sample of 30 bulbs has 2 defective bulbs so,

there is one defective bulb every

`(30)/(2) = 15`

bulbs.

total defective bulbs in 450 bulbs =

`(450)/(15) = 30`