WE need to find the probability (
)
We know Probability (
) =
P (
) =
First we find P(Girl)
From the table we can see that we have 18 girls out of (12+18=30) students
So P(Girl) =
Now we find the intersection of Junior and Girl
WE look at the Junior row and girls column that is 3
{P(Junior ∩ Girl) =
P (
) =
P (
) =
=
