Question

A company manufactures cell phones. In August, a random sample of
cell phones was inspected, and
phones were found to be defective. The company manufactured
cell phones in August. Based on the results from the sample, about how many cell phones are expected to be defective?
A
646464 cell phones
Selected
B
192192192 cell phones
C
2,6672,6672,667 cell phones
D
3,3603,3603,360 cell phones

Answer 1

C. 2,667 cell phones.

Reason: The sample defect rate is 48/720 = 1/15 ≈ 0.06667. Multiply by the 40,000 phones made: 0.06667 × 40,000 ≈ 2,666.67 ≈ 2,667.