The annual profits earned by 30 shops of a shopping complex in a locality are recorded in the table shown below:
Profit (in lakh Rs.) | Number of shops |
More than or equal to 5 | 30 |
More than or equal to 10 | 28 |
More than or equal to 15 | 16 |
More than or equal to 20 | 14 |
More than or equal to 25 | 10 |
More than or equal to 30 | 7 |
More than or equal to 35 | 3 |
If we draw the frequency distribution table for the above data, find the frequency corresponding to the class 20 - 25.
To find frequency corresponding to 20 - 25 class, we need to convert ‘more than or equal to’ type data into class intervals.
PROFIT (in lakhs) | FREQUENCY |
5 - 10 | 30 - 28 = 2 |
10 - 15 | 28 - 16 = 12 |
15 - 20 | 16 - 14 = 2 |
20 - 25 | 14 - 10 = 4 |
25 - 30 | 10 - 7 = 3 |
30 - 35 | 7 - 3 = 4 |
35 - 40 | 3 |
Observe in the table above, frequency corresponding to the class 20 - 25 is 4.