The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway.
Speed (mph)
Frequency
50 - 54
4
55 - 59
3
60 - 64
2
65 - 69
5
70 - 74
2
75 - 79
5
The standard deviation is
A. 9.06.
B. 9.28.
C. 86.19.
D. 82.09.
Answer: B
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