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Calculate mean Introduction of Variance and Standard Deviation

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Calculate mean, variation and standard deviation of the following frequency distribution: Classes Frequency 1 – 10 11 10 – 20 29 20 – 30 18 30 – 40 4 40 – 50 5 50 – 60 3 | Shaalaa.com

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Calculate mean、 Introduction of Variance and Standard Deviation、

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