$2.$ The two given discrete random variables X and Y:

X:

$12$

$0\mathrm{.}40\mathrm{.}6$

Y:

$-104$

$0\mathrm{.}30\mathrm{.}60\mathrm{.}1$

a$.$ Find the expected value of the random variables X and Y: MX ir MY;

b$.$ Find the variance of the random variables X and Y: DX ir DY$.$ What do we learn by comparing them?