Geometrically $Re\left(z^2-i\right)=2$ where $i=\sqrt{-1}$ and $\mathrm{Re}$ is the real part, represents

Let the sample space be nonnegative integers up to $50$, set $X$ denote the numbers which are multiples of $3$ and set $Y$ denote the odd numbers. Which of the following is$/$are correct $?$

$1.$ $P\left(X\right)=\frac{8}{25}$

$2.$ $P\left(Y\right)=\frac{1}{2}$

Select the correct answer using the code given below.

Consider the following statements:

$1.$ The coefficient of variation depends on the unit of measurement of the variable.

$2.$ The range is a measure of dispersion.

$3.$ Mean deviation is least when measured about the median.

Which of the above statements are correct $?$