Q.
If the arithmetic mean of the following distribution is 8.2, then a=xi: 1 3 5 9 11 13fi: 3 2 7 a 4 8
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a
5
b
6
c
9
d
none of these
answer is B.
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Detailed Solution
We have1×3+3×2+5×7+9a+11×4+13×83+2+7+a+4+8=8.2⇒3+6+35+9a+44+10424+a=8.2⇒9a+192=24×8.2+8.2a⇒0.8a=4.8⇒a=6
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