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 mean is
A. 9.
B. 77.
C. 65.
D. 67.
Answer: D
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