Question

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
56 - 64$56\text{ - }64$	14$14$
65 - 73$65\text{ - }73$	6$6$
74 - 82$74\text{ - }82$	13$13$
83 - 91$83\text{ - }91$	8$8$
92 - 100$92\text{ - }100$	12$12$