Question

Ellen plans to have two children but doesn't know if they are boy-boy, girl-girl, or boy-girl. What is the probability that she will have two girls?

0.25

0.5

0.75

1.00

I know the answer is .25 but how do you get that answer?

Answer 1

@shamil98
@wolfe8
@Hero

Answer 2

when one event is independent of the outcome of the prior event, you multiply the probabilities together.

Answer 3

3*3?

Answer 4

i just need to know how to solve to get .25

Answer 5

the probability of having a boy or a girl the first time is 50% or 0.50
the probability of having a boy or a girl the second time has nothing to do with whether the first baby was a boy or girl, it is also 50% or 0.50
so 0.50*0.50 = 0.25 or 25%

Answer 6

The probability of obtaining two consecutive events is the product of the probability of each independent event.