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in Statistics by (60 points)
Fid standard deviation, variance and coefficient of variation from the following data.  
wage (in  rupees)       no.of person
Less than 10 |.                 12
Less than 20 |.                 30
Less than 30 |.                 65
Less than 40 |.                 107
Less than 50 |.                 157
Less than 60 |.                 202
Less than 70 |.                 222
Less than 80 |.                 230

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