SB 7.5 probability of marbles

Question

5. Find the probability of selecting a green marble from a jar that contains 4 blue marbles, 3 red marbles, and 5 green marbles.

 

a. 1/3

b. 1/4

c. 5/12

d. 1/5

Answer 1

You have to find the total number of marbles first:   

 

4 + 3 + 5 = 12

 

Now you set up a fraction with the number of green marbles in the numerator and the total number in the denominator:

 

5/12

 

So the probability is 5/12.