Expected Reward Under A Stochastic Policy

In state $s$ an agent has three actions. The immediate reward is deterministic given the action, and the current policy is stochastic:

action	$\pi$ probability in $s$	immediate reward
$a_1$	0.5	2
$a_2$	0.3	10
$a_3$	0.2	-4

What is the expected immediate reward when the agent is in $s$ and follows $\pi$ ?

It cannot be computed from this table: $\pi$ gives probabilities over actions, so the transition probabilities $p(s' \mid s, a)$ are still needed before any expectation over rewards can be taken.

3.2

$\approx 2.67$