Suppose that the wrapper of your favorite candy bar lists it

Suppose that the wrapper of your favorite candy bar lists its weight as 2.13 ounces. Naturally, the weights of individual bars vary somewhat. Suppose that the weights of these candy bars vary according to a normal distribution with mean mu = 2.2 ounces and standard deviation sigma = 0.04 ounces. First, we want to determine what proportion of candy bars weigh less titan the advertised weight. Sketch the normal model needed to answer this. What is the z-score you need to use? Z = x - mu/sigama Use Table A-2 or the ztable.jmp tool to find the proportion. What proportion of candy bars weigh more than 2.31 ounces? Do your sketch, calculate your z-score, and write the proportion in the area below.

Solution