The mean deviation about the mean for the following data Marks obtained : 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 No. of boys 6 8 10 4 2

AP EAMCET Engineering 22 Apr 2019 Shift 1 Paper

Section: Mathematics

Question : 36 of 160

Marks: +1, -0

The mean deviation about the mean for the following data

Marks obtained :	0 - 10	10 - 20	20 - 30	30 - 40	40 - 50
No. of boys	6	8	10	4	2

ClassInterval	xi	(fi)	xi fi	\|xi−21\|	fi\|xi−21\|
0-10	5	6	30	16	96
10-20	15	8	120	6	48
20-30	25	8	250	4	40
30-40	35	4	140	14	56
40-50	45	2	90	24	48
	N=∑fi=30		∑xi fi=630	∑fi\|xi−21\|=288

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