The expected value and variance of the time needed by activity $B$ are, respectively:

$4,0\mathrm{.}4444$

$5,0\mathrm{.}4444$

$5,1\mathrm{.}7778$

$10,0\mathrm{.}4444$

none of the above

Question $2$

$3/3$ pts

The expected value and variance of the time needed by activity $D$ are, respectively