I can\'t remember how to construct a frequency polygon. The graph starts at -12

Question

I can't remember how to construct a frequency polygon. The graph starts at -12 in the left bottom corner. It goes: -12-13, 13-38, 38-63, 63-88, 88-113, 113-138, 138-163, 163-188, 188-213, 213-238, 238-263. A guide would be great. I just can't remeber the easy stuff:(

Previous 1 3 4 5 6 7 8 9 10 Question 2 of 20 (5 points) The number of bears killed in 2010 for 48 counties in Pennsylvania is shown in the frequency distribution. Construct a frequency polygon for the data. Class limits Frequency l-25 26 50 76-100 101-125 126 150 151-175 176-200 201-225 226-250 Total 48 Source: Pennsylvania State Game Commission Bear Kills umber Submit

Explanation / Answer

First you have to draw the hystogram. Now Find mid-points of each class (ie (1+25)/2=13; 38, 63 etc upto last class). Mark on the Hystogram for each of these midpoints ( for 13 frequency is 15, for 38 frequency is 12 ect). Joining all these points you will get an incomplete hystogram. To complete it connect the first class midpoint to the left (at first class midpoint-class interval) and last class midpoint to the right (at last class midpoint+ lass interval ie 25). Thats why it starts with -12 and ends with 263

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