Answer
$\frac{1}{6}$
Work Step by Step
The sample space in Exercise $3$ was:
[K Hearts, K Diamonds, Q Hearts, Q Diamonds, J Hearts, J Diamonds]
From this, we can see that there is only 1 possible queen of hearts among 6 different possibilities.
We can use the formula for probability, $P=\frac{n}{s}$.
$P=\frac{n}{s}$
$P=\frac{1}{6}$