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(2) Calculate variance and standard deviation from the following frequency distribution table Class interval 30-40 40-50 50-60 Frequency 13 12 5 0-10 35 10-20


 

(2) Calculate variance and standard deviation from the following frequency distribution table Class interval 30-40 40-50 50-60 Frequency 13 12 5 0-10 35 10-20 20-30 38 27

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