Question

A bag contains 11 red marbles, seven blue marbles, nine green marbles, and 13 yellow marbles.

Answer 1

First calculate the total amount of marbles 11 + 7 + 9 + 13 = 40

there are 7 blue marbles and a total of 40 marbles so theoretical probability of picking a blue marble from the bag is 7/40. hope this helps.

Answer 2

That is desired outcomes/total possible outcomes

desired=7 blue
total=total number of marbles=11+7+9+13=40

7/40 is da answer