The working table show the monthly expenditure of 80 students of a university on morning breakfast: Expenditure (in $.) No. of Students Expenditure in $ 2 530-570 No. of Students 780-820 13 6 480-520 7 430-470 12 380-420 18 330-370 730-770 580-720 7 530-670 4 580-620 2 Calculate Arithmetic mean, standard deviation and coefficient of variation of the above data.

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