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.
A. 32 - 42
B. 53 - 63
C. 9 - 19
D. 20 - 30
Correct Answer: C
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 6: Since the frequency is more for the class interval 9 - 19, the sales are maximum in this limit.