Progression (Sequence and Series)Medium
Question
If 
is the mean of a set of n observations x1, x2, x3,.....,xn then 
is equal to
is the mean of a set of n observations x1, x2, x3,.....,xn then is equal toOptions
A.M.D. about mean
B.S.D.
C.0
D.None of these
More Progression (Sequence and Series) Questions
The value of $1^{3} - 2^{3} + 3^{3} - \ldots. + 15^{3}$ is:...Let $G_{1},G_{2}$ are two geometric means and A is the arithmetic mean between two positive numbers, then $\frac{G_{1}^{...If tn be the nth term of an A.P. and if t7 = 9, then the value of the c.d. that would make t1t2t7 least is-...The G.M. of roots of the equation x2 − 2ax + b2 = 0 is equal to which type of mean of roots of x2 − 2bx + a2...If $a,b,c$ form an A.P. with comon difference $d( \neq 0)$ and $x,y,z$ form a G.P. with common ratio $r( \neq 1)$, then ...