Nicole pulls a colored marble out of a bowl, choosing the marble at random. There are 120 marbles in the bowl, of which 80 are black, 28 are white, and the rest are red. Use words and numbers to describe the probability that she will pull a red marble out of the bowl. Show your work
The total number of marbles in the bowl is 120.
The probability of pulling a red marble can be calculated by dividing the number of red marbles by the total number of marbles in the bowl.
Number of red marbles = Total number of marbles in the bowl - (Number of black marbles + Number of white marbles)
Number of red marbles = 120 - (80 + 28)
Number of red marbles = 120 - 108
Number of red marbles = 12
Therefore, the probability of Nicole pulling a red marble out of the bowl is:
Probability of pulling a red marble = Number of red marbles / Total number of marbles
Probability of pulling a red marble = 12 / 120
Probability of pulling a red marble = 1 / 10
Probability of pulling a red marble = 0.1
So, the probability that she will pull a red marble out of the bowl is 0.1 or 10%.