n प्रेक्षणों `x_(1),x_(2),....,x_(n)` का मानक विचलन 2 है | यदि `Sigma_(i=1)^(n) x_(i)=20" तथा "Sigma_(i=1)^(n) x_(i)^(2)=100` हो तो n का मान होगा-

If sum_(i=1)^(n)sin x_(i)=n then sum_(i=1)^(n)cot x_(i)=

If sum_(i=1)^(n)sin x_(i)=n then sum_(i=1)^(n)cot x_(i)=

If Sigma_(r=1)^(n) cos^(-1)x_(r)=0, then Sigma_(r=1)^(n) x_(r) equals

If Sigma_(r=1)^(n) cos^(-1)x_(r)=0, then Sigma_(r=1)^(n) x_(r) equals

If sum_(i=1)^(2n)cos^(-1)x_(i)=0 , then sum_(i=1)^(2n)x_(i) is :

The standard deviation of n observations x_(1),x_(2),......,x_(n) is 2. If sum_(i=1)^(n)x_(i)=20 and sum_(i=1)^(n)x_(i)^(2)=100 then n is

Find the sum Sigma_(j=1)^(n) Sigma_(i=1)^(n) I xx 3^j

Find the sum Sigma_(j=1)^(n) Sigma_(i=1)^(n) I xx 3^j

Find the sum Sigma_(j=1)^(n) Sigma_(i=1)^(n) I xx 3^j

A data consists of n observations x_(1), x_(2), ..., x_(n). If Sigma_(i=1)^(n) (x_(i) + 1)^(2) = 9n and Sigma_(i=1)^(n) (x_(i) - 1)^(2) = 5n , then the standard deviation of this data is