Question

Suppose 4% of all cell phone chips are defective. we randomly select 100 of the 50,000 cell phone chips produced in a day. what is the chance that 2 defective chips will be found?

Answer 1

Chips Defective Chips

Al chips 4 %

Total production per day 50.999 4 %

Randon sample sold 100 4 %

% defectives should be = % total production

Defectives expected in sample is 4% of 100 = 4 x 100 / 100 = 4

Chance of 2 defective chips 1