CK-12-Basic Probability and Statistics Concepts - A Full Course

6.4. Applications of Variance and Standard Deviation http://www.ck12.org

74 68 79 84 92 82 55 77 91

100 84 80 99 74 59 88 89 53

70 86 77 100 94 90 88 83 93

62 69 96 85 75 90 81 71 73

Answer:

To find the mean, variance, and standard deviation of these test scores, first press

STAT

on your TI calculator and choose Edit on the EDIT menu. Enter all of the scores into L1, and then press

2ND

MODE

to go back to the main screen.

Next, press

STAT

, go to the CALC menu, and choose 1-Var Stats.

After pressing

ENTER

to choose 1-Var Stats and then pressing

ENTER

again, you should see the following screen: