The following table shows the monthly expenditure of 80 students of a university on
breakfast :
Expenditure (Rs.) No. of students Expenditure (Rs.) No. of Students
780-820 2 530-570 13
730-770 6 480-520 9
680-720 7 430-470 7
630-670 12 380-420 4
580-620 18 330-370 2
Calculate mean, standard deviation, and coefficient of variation of above data.
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