A box contains 10 blue cubes, 5 red cubes, 5 blue marbles, and 10 red marbles. You randomly pick a blue shape out of the box. What is the probability that you picked a cube?

Answer 1

Probability = Number of Events/Total Possible Outcomes

Total Possible Outcomes = Total number of shapes = 10+5+5+10 = 30

Probability = # of blue shapes/Total number of shapes

(10+5)/30 = 1/2 = 50%

Probability = # of cubes shapes/Total number of shapes

(10+5)/30 = 1/2 = 50%