Class Limits
Definition of Class Limits
The lower and upper limits of a class interval are known as Class Limits.
More About Class Limits

All the class limits are generally of equal width and are mutually exclusive.
Video Examples: Upper & Lower Limit,Range,Class Width,Class Mark
Example of Class Limits
 The rainfall per day at a place (in mm) is recorded for 50 days are divided into different class interval as shown above.
 The 1st class limit is 1  4, 2nd class limit is 5  8, 3rd class limit is 9  12, 4th class limit is 13  16, 5th class limit is 17  20, and 6th class limit is 21  24.
Solved Example onClass Limits
Ques: The daily sales of books in a book stall for 20 consecutive days are:
Find the class limit in which the sales are maximum by constructing a frequency distribution table with 5 classes.
Choices:
A. 32  42B. 53  63
C. 9  19
D. 20  30
Correct Answer: C
Solution:

Step 1: Range of the data = higher value  lower value = 60  9 = 51
Step 2: Width = = 5/15 = 10.2 � 11
Step 3: Construct the class limits (daily sales of books) with width 11, so that the least and highest values have been included.
Step 4: The class limits, boundaries, tally marks and the frequency for each class (number of tally marks) are shown in the table.
Step 5:
Step 6: Since the frequency is more for the class interval 9  19, the sales are maximum in this limit.
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