+1 vote
69 views
in Maths & Statistics by

1 Answer

+1 vote
by
selected by (user.guest)
 
Best answer
Solution: Let A = the event that the first marble is black; and let B = the event that the second marble is black. We know the following:

 In the beginning, there are 10 marbles in the urn, 4 of which are black. Therefore, P(A) = 4/10.

 After the first selection, there are 9 marbles in the urn, 3 of which are black. Therefore, P(B|A) = 3/9.

Therefore, based on the rule of multiplication:

P(A ∩ B) = P(A) P(B|A)

P(A ∩ B) = (4/10)*(3/9) = 12/90 = 2/15

Related questions

Welcome to CPENTalk.com
Solution-oriented students of computer engineering on one platform to get you that

ONE SOLUTION

...