SSC CGL Tier II 21 Sep 2014 Paper

Question : 77 of 100

Marks: +1, -0

The arithmetic mean of the following numbers
1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6 and 7, 7, 7, 7, 7, 7, 7 is

Solution:

(2) Required mean

1 × 1+2 × 2+3 × 3+4 × 4

= {+5 × 5+6× 6+7 × 7}/{1+2+3+4+5+6+7}

= {1+4+9+16+25+36+49}/{28}

= {140}/{28}=5

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