Q .     If `x_1,x_2,.........,x_n` are `n` observations such that `sum_(i=1)^nx_i^2=400` and `sum_(i=1)^nx_i=80` then the least value of` n` is

EAMCET 2014
A

`18`

B

`12`

C

`15`

D

`16`

HINT

Variance `=>(sum(x_i)^2)/n-((sumx_i)/n)^2`
0
Success Rate: NAN %
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