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I got number 20 wrong, could you help me choose the correct answer? 40 (L84) The chemistry test scores of 9 students were as follows:

I got number 20 wrong, could you help me choose the correct answer?
40 (L84) The chemistry test scores of 9 students were as follows: 100, 84, 91, 77, 69, 92, 93, 93, and 88. Use a TI-83 or TI-84 calculator to find the standard deviation of these chemistry test scores. The answer should be rounded to one decimal place. A. 5.4 B. 7.6 C. 8.9 D. 9.7 E. 11.3

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