A random sample of 100 foxes was examined by a team of veterinarians to determine the prevalence of a particular type of parasite. Counting the number of parasites per fox, the veterinarians found that 69 foxes had no parasites, 17 had one parasite, and so on. A frequency tabulation of the data is given here:

a. Construct a relative frequency histogram for x, the number of parasites per fox.
b. Calculate and s for the sample.
c. What fraction of the parasite counts fall within two standard deviations of the mean? Within three standard deviations? Do these results agree with Tchebysheff's Theorem? With the Empirical Rule?

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Number of Parasites, x 01 2 3 4 5 6 7 8 Number of Foxes, f 69 17 6 3 1 2 0 1