Tuesday
July 28, 2015

Homework Help: Math

Posted by Allen on Friday, May 27, 2011 at 12:15pm.

Here's a frequency distribution table for the speeds of a sample of automobiles.

Speed(MPH) Frequency Midpoint(I found)
50-54 2 52
55-59 4 57
60-64 5 62
65-69 10 67
70-74 9 72
75-79 5 77
I am trying to find the variance but whatever I do I can't seem to find the answer.
The choices are
c.48.570
d.50.00

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