A Child Has a Bag of Marbles Containing the Following

Multiple Choice

A child has a bag of marbles containing the following types and frequencies of marbles:
Blue - 3
Red- 7
Blue and Red Striped - 18
Black - 9
If the child reaches into the bag and pulls out a marble without looing, what are the odds that the marble will be black?

A) 0.90
B) 0.33
C) 1.00
D) 0.24