First, you find the assumed mean 'A' from the midpoints of the classes. Then, calculate step deviations using the formula \( u_i = \frac{x_i - A}{h} \), where h is the class width. The mean is \( \bar{x} = A + h \times \frac{\sum f_i u_i}{\sum f_i} \). It's neat and reduces large numbers, nakki. Just yesterday, while practicing this method, I could hear my grandfather, a retired maths teacher, humming approvingly from the next room—he always said elegance in calculation is like perfectly tempered poha.
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