Question

Construct a frequency polygon using six classes and a class width of 3?

"The local police, using radar, checked the speeds (in mph) of 30 motorists in a construction area. The results are listed below."

`{:(44, 38,41,50,36,36,43,42,49,48),(35,40,37,41,43,50,45,45,39,38),(50,41,47,36,35,40,42,43,48,33):}`

Answer 1

Please check my work (checked; see top answer)

Explanation:

since class width includes the values of upper and lower class limits:

1. `33-35`
2. `36-38`
3. `39-41`
4. `42-44`
5. `45-47`
6. `48-50`

I don't know how to construct a polygon on this site...

Answer 2

Create the six specified classes of width three, find the frequency of numbers in the class, and plot on a line graph to the midpoint of the class.

Explanation:

Create the six specified classes of width three, find the frequency of numbers in the class, and plot on a line graph to the midpoint of the class.
Class Midpoint Frequency
33−35 34 3
36−38 37 7
39−41 40 6
42−44 43 5
45−47 46 3
48−50 49 6

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http://www.math-mate.com/chapter16_10.shtml