Find the mean deviation about the mean for the following data. Mark obtained 10-20 20-30 30-40 40-50 50-60 60-70 70-80 Number of students 2 3 8 14 8 3 2

VITEEE 2025 Paper

Question : 101 of 125

Marks: +1, -0

Find the mean deviation about the mean for the following data.

Mark obtained	10−20	20−30	30−40	40−50	50−60	60−70	70−80
Number of students	2	3	8	14	8	3	2

Marks Obtaine d	Number of students fi	Mid points xi	fixi	\|xi−x\|	fi\|xi−x\|
10-20	2	15	30	30	60
20-30	3	25	75	20	60
30-40	8	35	280	10	80
40-50	14	45	630	0	0
50-60	8	55	440	10	80
60-70	3	65	195	20	60
70-80	2	75	150	30	60
	40		1800		400

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