NCERT Exercise 13.2 Q8 - Statistics

Question: For classes 0-10, 10-20, ..., 40-50 with frequencies 5, 8, 15, 16, 6, find mean and variance.

Answer: Use class marks 5, 15, 25, 35, 45 and the grouped variance formula.

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

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