In a survey work, three independent angles $X, Y$ and $Z$ were observed with weights $W_{X}, W_{Y}, W_{Z}$ respectively. The weight of the sum of angles $X, Y$ and $Z$ is given by:
(A) $1 /\left(\frac{1}{W_{X}}+\frac{1}{W_{Y}}+\frac{1}{W_{z}}\right)$
(B) $\quad\left(\frac{1}{W_{X}}+\frac{1}{W_{Y}}+\frac{1}{W_{Z}}\right)$
(C) $\quad W_{X}+W_{Y}+W_{Z} \quad$

(D) $\quad W_{X}^{2}+W_{Y}^{2}+W_{Z}^{2}$

Question ID - 1 | SaraNextGen Top Answer

In a survey work, three independent angles $X, Y$ and $Z$ were observed with weights $W_{X}, W_{Y}, W_{Z}$ respectively. The weight of the sum of angles $X, Y$ and $Z$ is given by:
(A) $1 /\left(\frac{1}{W_{X}}+\frac{1}{W_{Y}}+\frac{1}{W_{z}}\right)$
(B) $\quad\left(\frac{1}{W_{X}}+\frac{1}{W_{Y}}+\frac{1}{W_{Z}}\right)$
(C) $\quad W_{X}+W_{Y}+W_{Z} \quad$

(D) $\quad W_{X}^{2}+W_{Y}^{2}+W_{Z}^{2}$