find the probability

Question

35 Blue (B); 20 Large (L), 15 Small (S)

30 Yellow (Y); 5L, 25S

20 Green (G); 15L, 5S

15 Red (R); 10L, 5S

 

1.p(R|L) or p(R/L)

Answer 1

P(R|L) = P(R and L) / P(L) 

 

P(R and L) = 10/100

P(L) = 50/100

 

So P(R|L) = (10/100) / (50/100) = (10/100)*(100/50) = 10/50 = 1/5