NCERT Exercise 13.1 Q9 - Statistics

Question: For monthly-income classes 0-100, 100-200, ..., 700-800 with frequencies 4, 8, 9, 10, 7, 5, 4, 3, find mean deviation about the mean.

Answer: Use class marks 50, 150, ..., 750 and the grouped mean-deviation formula.

Full step-by-step NCERT solution with diagrams on Something by Zero.

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