Statistics Examples
ClassFrequency10-14115-19320-24925-292ClassFrequency10−14115−19320−24925−292
Step 1
The lower limit for every class is the smallest value in that class. On the other hand, the upper limit for every class is the greatest value in that class.
ClassFrequency(f)LowerLimitsUpperLimits10-141101415-193151920-249202425-2922529ClassFrequency(f)LowerLimitsUpperLimits10−141101415−193151920−249202425−2922529
Step 2
The class width is the difference between the upper or lower class limits of consecutive classes. All classes should have the same class width. In this case, class width equals to the difference between the lower limits of the first two classes.
w=15-10w=15−10
Step 3
Simplify to find that the class width is 55.
55
