The manufacturer of a certain brand of aluminum foil claims that the amount of foil
on each roll follows a Normal distribution
with a mean of 250 ft? and a standard
deviation of 2 ft? To test this claim, a
restaurant randomly selects 10 rolls of this
aluminum foil and carefully measures the
mean area to be. rº = 249.6 ft?
Find the probability that the sample mean
area is 249.6 ft- or less if the manufacturer's
claim is true.