Question

Numbered disks are placed in a box and one disk is selected at random. If there are four red disks numbered 1, 2, 3, and 4, and six yellow disks numbered 5, 6, 7, 8, 9, and 10, find the probability of selecting a red disk given that an odd-numbered disk is selected?

Answer 1

The odd disks are 1 and 3 (which are red) and 5,7, and 9 (which are yellow).

If we know that an odd disk is chosen at random, the probability that it will be red is equal to \[100* \frac{ R}{T }\] where R is the number of red disks and T is the total number of disks.

We know that R is 2 and that T is 5 by counting.

Answer 2

Thank You ^_^ I just have no luck with these types of questions...