The variance of the following distribution is Marks 1-3 3-5 5-7 7-9 Number of students 40 30 20 10

AP EAMCET Engineering 2018 Apr 22 Shift 2 Paper

Section: Mathematics

Question : 36 of 160

Marks: +1, -0

The variance of the following distribution is

Marks	1-3	3-5	5-7	7-9
Number of students	40	30	20	10

Marks	Mid interval value (x)	f	f(x)	x2	f(x2)
1-3	2	40	80	4	160
3-5	4	30	120	16	480
5-7	6	20	120	36	720
7-9	8	10	80	64	640

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