There are 3 blue, 2 red, and 4 yellow marbles in a bag.

Question

 if one marble is chosen at random, what is the probability that it will be blue?

Answer 1

3 blue + 2 red + 4 yellow = 9

There are 9 marbles in a bag.

Probability of choosing one bluen marble randomly from the bag P(E) = (number of favourable events )/(total number of events)

= 3/9

= 1/3.