Question

On the avarage, one is 400 item is defective. If the items are packed in boxes of 100. What is the probability that any given box of items will contain no defective?

Answer 1

One of 400 items is defective

The number of boxes are 400/100=4 boxes.

The boxes that contain the defective item= one box

The boxes with no defect =4-1=3

The probability that any given box of items will contain no defective items=

number of boxes with no defects/total number of boxes

=3/4.