If $x_i>0, y_i>0(i=1,2,3,\dots ,n)$ are the values of two variables $X$ and $Y$ with geometric means $P$ and $Q$ respectively, then the geometric mean of $\frac{X}{Y}$ is

If probability of simultaneous occurrence of two events $A$ and $B$ is $p$ and the probability that exactly one of $A,B$ occurs is $q$, then which of the following is/are correct?

$1. P\left(\overline{A}\right)+P\left(\overline{B}\right)=2-2p-q$

$2. P(\overline{A}\cap \overline{B})=1-p-q$

Select the correct answer using the code given below.

An analysis of monthly wages paid to the workers in two firms $A$ and $B$ belonging to the same industry gives the following result:

The average of monthly wage and variance of distribution of wages of all the workers in the firms $A \& B$ taken together are

In any discrete series (when all values are not same), if $x$ represents mean deviation and $y$ represents standard deviation, then which one of the following is correct?