A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of milligrams and a standard deviation of milligrams. What is the probability that randomly selected light cigarettes from this company will have a total combined nicotine content of milligrams or more, assuming the company's claims to be true?

Question

A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of  milligrams and a standard deviation of  milligrams. What is the probability that  randomly selected light cigarettes from this company will have a total combined nicotine content of  milligrams or more, assuming the company's claims to be true?

PsyDAG · Answer

Your numbers are missing. Once you find them:

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.