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.


8