Use the computer to find the sample variance s² and the sample standard deviation s for the 50 companies’ percentages of revenues spent on R&D, given in Table 2.2 

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Table 2.2 Percentage of Revenues Spent on Research and Development Company Percentage 1 13.5 T99TTOLOSAWNI 2 10 11 12 13 8.4 10.5 9.0 9.2 9.7 6.6 10.6 10.1 7.1 8.0 7.9 6.8 Company 14 15 S181812 16 17 19 20 22 23 24 25 26 Percentage 9.5 8.1 13.5 9.9 6.9 7.5 11.1 8.2 8.0 7.7 7.4 6.5 9.5 Company 27 28 29 30 31 32 33 34 35 36 37 38 Percentage 8.2 6.9 7.2 8.2 9.6 7.2 8.8 11.3 8.5 9.4 10.5 6.9 Company 39 40 41 42 43 44 45 6 4 48 49 50 46 47 Percentage 6.5 7.5 7.1 13.2 7.7 5.9 5.2 5.6 11.7 6.0 7.8 6.5