If defects were 10 in 1000 units, what would the defect rate be?

If defects were 10 in 1000 units, what would the defect rate be?

• A. 0.5%
• B. 1.0%
• C. 1.5%
• D. 2.0%

Answer: (B)

Defect rate is the portion of items that are defective. With ten defective units in a sample of one thousand, the rate is 10/1000 = 0.01. Multiply by 100 to convert to a percentage: 0.01 × 100 = 1%. So the defect rate is 1 percent. For comparison, a rate of 0.5 percent would mean five defects per thousand; 1.5 percent would be fifteen per thousand; 2.0 percent would be twenty per thousand.

Defect rate is the portion of items that are defective. With ten defective units in a sample of one thousand, the rate is 10/1000 = 0.01. Multiply by 100 to convert to a percentage: 0.01 × 100 = 1%. So the defect rate is 1 percent. For comparison, a rate of 0.5 percent would mean five defects per thousand; 1.5 percent would be fifteen per thousand; 2.0 percent would be twenty per thousand.