A company claims that its low-salt potato chips contain only 85 mg of sodium per serving on average. An independent company randomly selects a package of the potato chips, which turns out to contain 93 mg of sodium per serving.
a. Assuming the sodium levels per serving of the low-salt potato chips are approximately normally distributed with mean 85 mg and standard deviation 3 mg, find the probability that a randomly selected package of the tortillas would have at least 93 mg of sodium per serving.
b. If the assumptions you made in part (a) are true, is the package containing 93 mg of sodium per serving an un- usual event?
c. Describe a scenario in which the package containing 93 mg of sodium per serving is not an unusual event.
d. On the basis of the package containing 93 mg of sodium per serving, do the assumptions you made in part (a) seem reasonable? Should a more thorough investigation occur?