A discrete random variable $x$ has the following probabi

$\backslash$table$[[x,77,78,79,80,81],[P(x=x),0\mathrm{.}15,0\mathrm{.}15,0\mathrm{.}20,0\mathrm{.}40,0\mathrm{.}10]]$

Compute each of the following quantities.

$P(x<mn\; id="EditorElement\_3851">8</mn><mn\; id="EditorElement\_3852">0</mn><mi\; id="EditorElement\_3854">)</mi>$

$P(x80)$

$P(x>78|77x87)$

$E(3x-8)$

Var$(1-3x)$