Samples of student cars and faculty/staff cars were obtained at the author's college, and their ages (in years) are summarized in the accompanying frequency table. Find the standard deviation in age of student cars and of faculty/staff cars. Based on the results, are there any noticeable differences between the two samples? If so, what are they?

Find the standard deviation of the data summarized in the given frequency table.

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Age Sudents Faculty/Staff 0-2 3-5 6-8 9-11 12-14 15-17 18-20 21-23 23 30 47 36 30 68 19 10