A group of screwdrivers produced in a day at a particular factory has a defect rate of 0.7%. Suppose a quality inspector randomly inspects 500 screwdrivers. Complete the following statement: The quality inspector should expect ____defective screwdrivers, with an error of ____.
A)35; 0.4%
B)3.5; 0.4%
C)1; 4.0%
D)1; 0.4%

Question

Quizplus · Accepted Answer

The expected number of defective screwdrivers is calculated by multiplying the total number of screwdrivers inspected (500) by the defect rate (0.7%), which equals 3.5. The error is not explicitly calculable from the given information, so the choice with the correct expected number and a plausible error percentage is selected.

A Group of Screwdrivers Produced in a Day at a Particular