Based on the calculations, the number of blue marbles in this bag is equal to 15 blue marbles.
<u>Given the following data:</u>
- Total number of marbles = 20 marbles.
- Probability of not selecting a blue marble = ¼.
<h3>How to calculate the number of blue marbles?</h3>
In this exercise, you're required to calculate the number of blue marbles considering the fact that the probability of not selecting a blue marble from this bag is ¼.
First of all, we would determine the probability of actually selecting a blue marble from this bag as follows:
Probability = 1 - nP(B).
Probability = 1 - ¼.
Probability = ¾.
Now, we can calculate the number of blue marbles:
P(B) = total number of blue marbles/total number of marbles
¾ = B/20
4B = 60
B = 60/4
Blue marbles, B = 15 blue marbles.
Read more on probability here: brainly.com/question/12801413
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