We already worked out the probabilities before:

Possible Outcome RR RB BR BB
xi 2 1 1 0
P(xi) $\dfrac{2}{15}$ $\dfrac{4}{15}$ $\dfrac{4}{15}$ $\dfrac{1}{3}$


MATH

This means that if we performed this experiment 1000 times, we would expect to get 800 red balls.