A jar contains 9 red buttons, and 21 blue buttons. A button is taken at random from the jar. What is the probability that it is: a. red?

Question

I need help with this problem please

Answer 1

With any question like this, simply find how many event meet the criteria, and then divide by the total number of events.

In this case, the "event" is picking one button. The total number of possibilities is 30.

Therefore the probability for red is is 9 / 30 = 30%

probability for blue is is 21 / 30 = 70%