Add 0.5 to upper limit and subtract 0.5 from lower limit
Step-by-step explanation:
Step 1: Find the class interval column where limits are given
e.g. Class Interval
10-20
20-30
30-40
Step 2: Identify the upper limit and the lower limit
Upper limits : 20, 30, 40
Lower limits: 10, 20, 30
Step 3: Add 0.5 in the upper limit to find the upper limit of the class boundary
20+0.5=20.5
30+0.5=30.5
40+0.5=40.5
Step 4: Subtract 0.5 in the lower limit to find the lower limit of the class boundary
10-0.5=9.5
20-0.5=19.5
30-0.5=29.5
Step 5: Make a column of class boundary and write the values
Class intervals Class boundaries
10-20 9.5-20.5
20-30 20.5-30.5
30-40 30.5-40.5
Keyword: Distribution
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