Question

From 12,000 graphing calculators produced by a​ manufacturer, an inspector selects a random sample of 550 calculators and finds 6 defective calculators. Estimate the total number of defective calculators out of the 12,000.

Answer 1

131

Explanation:

Using proportion,

If Out of 550 calculators = 6 are defective,

Then out of 12000 calculators = ? are defective

`(12000 calculators)/(550calculators) * 6`

= 21.8 * 6

= 130.8 ≈ 131

∴ Approximately 131 calculators are defective