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Calculate the sample standard deviation and sample variance for the following frequency distribution of final exam...

Calculate the sample standard deviation and sample variance for the following frequency distribution of final exam scores in a statistics class. If necessary, round to one more decimal place than the largest number of decimal places given in the data.

Final Exam Scores
Class Frequency
51 - 6051 - 60 1010
61 - 7061 - 70 77
71 - 8071 - 80 1212
81 - 9081 - 90 1111
91 - 10091 - 100 1515
Math   Statistics-And-Probability   
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