Statistics Examples

Find the Midpoints of the Frequency Table
ClassFrequency12-14415-17519-21922-242
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)LowerLimitsUpperLimits12-144121415-175151719-219192122-2422224
Step 2
The class midpoint is the lower class limit plus the upper class limit divided by 2.
ClassFrequency(f)LowerLimitsUpperLimitsMidpoint(M)12-144121412+14215-175151715+17219-219192119+21222-242222422+242
Step 3
Simplify all the midpoint column.
ClassFrequency(f)LowerLimitsUpperLimitsMidpoint(M)12-14412141315-17515171619-21919212022-242222423
Step 4
Add the midpoints column to the original table.
ClassFrequency(f)Midpoint(M)12-1441315-1751619-2192022-24223
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