What is the lower limit of the class interval 20-30 of grouped data?
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The lower limit for every class is the smallest value in that class. ...
The lower boundary of each class is calculated by subtracting half of the gap value 12=0.5 1 2 = 0.5 from the class lower limit. ...
Simplify the lower and upper boundaries columns. ...
Add the lower and upper class boundaries columns to the original table.
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