Find the class midpoints. Do all of the classes have the same width? If so, what is this width? If not, what are the different class widths?
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To find the class midpoint, take the average of the class endpoints
class 0 – 4 midpoint (0 + 4)/2 = 2
class 5 – 9 midpoint ( 5 + 9)/2 = 4.5
Another example class 10.0 – 19.9 = (10+ 19.9)/2 = 14.95
The classes usually have the same width, but this is not essential
For example 0 - 9
20 – 29
30 – 59
(The last class has different width). You decide the width according to your data, so it will be different wdths.
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