Calculate the sample mean 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 66 - 72 6 73 - 79 5 80 - 86 3 87 - 93 12 94 - 100 14 Sample mean: Sample variance:
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