Question: The grades of a student in five subjects are: 85, 92, 81, 70, 92.

a. Find the mean grade.

b. Find the range of grade.

c. Find the variance and standard deviation using the computational formula.

d. Find the variance and standard deviation using the definitional formula.

e. Are the answers in parts “c” and “d” equal? Verify using Excel’s “fx” feature.

f. Are the answers in parts “c” and “d” equal? Verify using “descriptive statistics” feature of Excel.

g. Circle the value of standard deviation obtained in parts “c”, “d”, “e”, and “f”.