Question

a bag contains 13 blue balls 6 black ball find the probability a red ball and black ball​

Answer 1

Answer:

Use law of totalprobability

P(r) = p(r|bag a) p( bag a) + p r|bag b) p(bag b)

P( bag a) = p(bag b)= 1/2

If from bag a( 3r, 8b) p(r| a)= 3/(3+8)=3/11

If from bag b(5r, 7b), p( r|b) = 5/(5+7)= 5/12

Putting it together

1/2*(3/11+5/12)

Step-by-step explanation: