Calculate the number of shops corresponding to class interval 30-40 of the following distribution

CBSE Class 11 CBSE Class 11 Economics
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1

Calculate the number of shops corresponding to class interval 30-40 of the following distribution

The mean profit per shop is 28.

2

Let f be the missing frequency.
Calculation of Missing Frequency

Calculation of Missing Frequency.png982×370 30.2 KB

3(80+f) = (f + 10) x 10 ====> 7f =140 ====> f = 20
Thus, number of the shops corresponding to profit 30-40 is 20.