Monday

October 20, 2014

October 20, 2014

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.

**Answer this Question**

**Related Questions**

stastics - Following are the speeds of 40 cars clocked by radar on a particular ...

Math...LOST!! - Heights The frequency distribution indicates the heights of 45 ...

math - 1. To form a __________ we form a ratio between each frequency and the ...

statistics - I have done an entire project based on football scores from a ...

MATH - The frequency distribution indicates the heights of 45 male high school ...

statistics - Suppose you are commparing frequency date for two groups,25 ...

Math 540 - The Department of Management Science at Tech has sampled 250 of its ...

physics - .Two automobiles are equipped with the same single-frequency horn. ...

physical - You are traveling in a car toward a hill at a speed of 42.1 mph. The ...

physics - You are traveling in a car toward a hill at a speed of 40.8 mph. The ...