# The electricity bills (in rupees) of 25 houses in a locality are given below. Construct a grouped frequency distribution table with a class size of 75.170, 212, 252, 225, 310, 712, 412, 425, 322, 325, 192, 198, 230, 320, 412, 530, 602, 724, 370, 402, 317, 403, 405, 372, 413

Given are electricity bills (in rupees) of 25 houses in locality.

To construct a grouped frequency distribution table with a class size of 75, note down smallest and largest number from the data.

Smallest number = 170

Largest number = 724

So, let the class interval start from 150.

Then, add 75 to 150 = 150 + 75 = 225

First class interval = 150-225

Similarly,

Second class interval = 225-300 [ 225 + 75 = 300]

And so on…

For frequencies, count the occurrence of the numbers lying between the particular class interval.

Let us construct a table in order to show these class intervals along with their frequencies.

Thus, this is the required frequency distribution table.

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