First, choose an assumed mean from the class marks, then find the step deviations 'u_i' by subtracting the assumed mean and dividing by the class width. The mean is calculated as: Assumed Mean + (Σf_i u_i / Σf_i) * class width. Every week, I tally my study hours in a grouped table, khup chhan, using this very method to see if my average is improving—it feels like measuring the tide, steady and mathematical, even when progress seems slow.
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