There are two ways to solve this problem.
In the first method, you subtract the number of black and white marbles from the total, then divide by the total number of marbles to find the number of red marbles.
In the second method, you simply divide the number of red marbles by the total number of marbles to calculate the probability of pulling a red marble.
Using either method, the probability of Nicole pulling a red marble out of the bowl is 0.1 or 10%.
rephrase this
There are two methods to solve this problem.
Method 1: Subtract the number of black and white marbles from the total, then divide by the total number of marbles.
Number of red marbles = Total number of marbles - Number of black marbles - Number of white marbles
Number of red marbles = 120 - 80 - 28
Number of red marbles = 12
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 = 0.1 or 10%
Method 2: Divide the number of red marbles by the total number of marbles.
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 = 0.1 or 10%
Either method gives us a probability of 0.1, or 10%, that Nicole will pull a red marble out of the bowl.
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