⇒x̄ = 37.5 – 8.28
⇒x̄ = 29.22
∴ Mean = 29.22
Here, the maximum no. of students per teacher i.e. 10, and the class corresponding to this frequency is 30 – 35
So, the modal class is 30 – 35 .
lower limit (l) of modal class = 30,
class size(h) = 5
frequency (f1) of the modal class = 10
frequency (f0) of class preceding the modal class = 9
frequency (f2) of class succeeding the modal class = 3
Now, let us substitute these values in the formula
= 30 + 0.625
Mode = 30.625(approx.)