marble probability

Question

find the probability of picking a red or yellow marble from a bag contaning 8 red, 4 green, and 2 yellow marbles

Answer 1

Probability(red or yellow) = (number of red+number of yellow)/(total number of marbles)

= (8+2)/(8+4+2) = 10/14 = 5/7

Answer 2

In total, the bag has 14 marbles in it. We get that from adding the 8 red marbles, 4 green marbles, and 2 yellow marbles.

We get the amount of red and yellow marbles by adding the 8 red marbles and the 2 yellow marbles together, giving us 10 marbles. So, we have a 10/14 chance of picking a red or yellow marble.

To change this to a percent, you will do 10/14 x 100%.

So, in total, you have a 71.43% chance of picking either a red marble or a yellow marble.