#### Answer

$\frac{1}{13}$

#### Work Step by Step

P(E) = $\frac{no.\ of\ outcomes\ in\ favor}{Total\ no\ of\ outcomes}$
There is a total of 52 cards, so there are 52 outcomes.
There are 4 jacks, so there is a total of 4 favorable outcomes.
P(E) = $\frac{4}{52}$ = $\frac{1}{13}$