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Calculate the mean and standard deviatio...

Calculate the mean and standard deviation for the following data: Wages upto (into Rs.) 15 30 45 60 75 90 105 120 No. of workers 12 30 65 107 157 202 222 230

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The mean=`67.5+(sumf_iu_i)/(sumf_i) times 15`
`=(67.5)+(-105/230) times 15`
`=67.5-6.85`
`=60.65` nearly
...
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