Potato chips The weight of potato chips in a mediumsize bag is stated to be 300 g. The amount that the packaging machine puts in these bags is believed to have a Normal model with mean 306 g and standard deviation 3.6 g.

a) What fraction of all bags sold are underweight?

b) Some of the chips are sold in “bargain packs” of three bags. What is the probability that none of the three is underweight?

c) What is the probability that the mean weight of the three bags is below the stated amount?

d) What is the probability that the mean weight per bag of a 24-bag case of potato chips is below 300 g?