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4.Average
medium
The arithmetic mean of the following numbers is $1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,6,7,7,7,7,7,7,7$
A
$4$
B
$5$
C
$14$
D
$20$
Solution
Required mean
$=\frac{1 \times 1+2 \times 2+3 \times 3+4 \times 4+5 \times 5+6 \times 6+7 \times 7}{1+2+3+4+5+6+7}$
$=\frac{1+4+9+16+25+36+49}{28}$
$=\frac{140}{28}=5$
Standard 13
Quantitative Aptitude