Any help offered in solving the below question will be much appreciated.

Thanks

Kingman

A manufacturer makes balls which are packed in cartons of 20 and send to market

for sale. A ball will not meet the minimum requirement for packing for sale if it weighs less than 20 grams. On average 2% of the balls made did not meet the minimum requirement.

Find the probability that out of 4 randomly chosen cartons of balls, there are exactly 2 cartons with at least 1 ball that does not meet the minimum requirement. (0.295)