You are performing a study about monthly per capita cocoa consumption in a city. A previous study found monthly per capita cocoa consumption to be normally distributed, with a mean of 21 grams and a standard deviation of 4.5 grams. You randomly sample 30 people and record the monthly cocoa consumptions shown below.

(a) Draw a frequency histogram to display these data. Use seven classes.
Do the consumptions appear to be normally distributed? Explain.

(b) Find the mean and standard deviation of your sample.

(c) Compare the mean and standard deviation of your sample with those of the previous study. Discuss the differences.

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