Question

Use the display of data to find the standard deviation.
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Question content area top right
Part 1
A bar graph titled Score with a horizontal axis labeled from 6 to 12 in increments of 1 and a vertical axis labeled Frequency from 0 to 15 in increments of 3 contains one vertical bar of height 4 located at 9 on the horizontal axis.
Score
6
7
8
9
10
11
12
0
3
6
9
12
15
Frequency

Answer 1

All four scores are 9, so the mean is 9 and every deviation from the mean is 0. Therefore the variance and standard deviation are 0.