A company claims that its low-salt tortillas contain only 130 mg of sodium per serving on average. An independent company randomly selects a package of the tortillas, which turns out to contain 141 mg of sodium per serving.
a. Assuming the sodium levels per serving of the low-salt tortillas are approximately normally distributed with mean 130 mg and standard deviation 4 mg, find the probability that a randomly selected package of the tortillas would have at least 141 mg of sodium per serving.
b. If the assumptions you made in part (a) are true, is the package containing 141 mg of sodium per serving an un- usual event?
c. Describe a scenario in which the package containing 141 mg of sodium per serving is not an unusual event.
d. On the basis of the package containing 141 mg of sodium per serving, do the assumptions you made in part (a) seem reasonable? Should a more thorough investigation occur?