A bag has 3 red and 5 blue marbles, P(green)

Step by step, with the reason for every step · Probability · Probability

Step by step

Question: A bag has 3 red and 5 blue marbles.

One marble is picked without looking.

What is the probability it is green?

The probability is a fraction: the outcomes we want, over all the outcomes.

P(green) = we wantall

P stands for probability.

P = probability

So there are 8 marbles in all.

all = 8

3 plus 5 is 8.

3 + 5 = 8

There are no green marbles.

we want = 0

It is impossible.

So the probability is 0.

P(green) = 08 = 0

Let's look back.

First: count all outcomes.

Last: count the ones we want.

Answer

P(green) = 08 = 0