Question

help.

Answer 1

the last one.

Answer 2

Well, the probability of having tails come up on the coin is 1/2 and the probability that the cube shows and even number is (also) 1/2.

Multiply the to, 1/2 * 1/2 , and you get 1/4.
(Why multiply? b/c we are finding the probability of the 2 events occuring at once, you know what I mean).

Answer 3

prob of red and blue is= (2+3)/(2+3+5)=1/2

Answer 4

number 10 not number 9.

Answer 5

There are 5 red and blue marbles.
And the bag contains total of 12 marbles.
(doesn't matter that you chose a marble, since you returned it already, before chosing again)

No, (3+2) / (2+3+5) = 5/10=1/2 as hanzi sad before.

Answer 6

so whats number 9? cause i got 1/2 for number 9.

Answer 7

No, you are close though...

the Probability of 2 events (rolling even on a cube, and having tails come up on the coin) is what you are looking for.

The probability of rolling even on the cube is 1/2 because exactly half of the numbers on the cube are even (they are "2", "4" and "6", OUT OF 1,2,3,4,5,6 )

The probability of having (the side of) tails (on the coin) come up, is also 1/2, becuase it is 1 of the 2 sides.

The probability of these 2 events talking place is the product of their probabilities.

1/2 times 1/2 = 1/4.