NCERT Exercise 13.2 Q7 - Statistics

Question: For classes 0-30, 30-60, ..., 180-210 with frequencies 2, 3, 5, 10, 3, 5, 2, find mean and variance.

Answer: Use class marks 15, 45, ..., 195 and grouped-data formulas.

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

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