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March 29, 2015

March 29, 2015

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

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

- Math -
**PsyDAG**, Saturday, May 28, 2011 at 2:19amUsing the midpoints of each interval, to find the mean first = sum of scores/number of scores.

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

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