Out of 10 total blocks, 3 blocks are yellow. Ramona picks a block and doesn't put it back. Then Beezus picks a block. What is the probability that both girls pick yellow?

6.7%

Step-by-step explanation:

Out of 10 total blocks, 3 blocks are yellow. Ramona picks a block and doesn't put it back. Then Beezus picks a block. What is the probability that both girls pick yellow?

They are two independent events, therefore, the final probability is the multiplication of both events.

First event, Ramona.

There are 3 yellow blocks and 10 in total. Therefore the probability is:

3/10

Second event, Beezus

Ramona took out a yellow block, so there are 2 yellows and 9 in total, therefore:

2/9

The final probability is:

P = 3/10 * 2/9

P = 0.067

Which means that the probability is 6.7%