The probability the marble is not red = 3/5
What is probability?
"Probability is a branch of mathematics which deals with finding out the likelihood of the occurrence of an event."
Formula of the probability of an event A is:
P(A) = n(A)/n(S)
where, n(A) is the number of favorable outcomes, n(S) is the total number of events in the sample space
For given question,
A bag contains 5 blue, 8 red, and 7 green marbles.
n(S) = 5 + 8 + 7
n(S) = 20
Let event A: selecting red marble
n(A) = 8
So, the probability of selecting red marble would be,
P(A) = n(A)/n(S)
P(A) = 8/20
P(A) = 2/5
So, the probability of selecting the marble which is not red
1 - P(A)
= 1 - 2/5
= 3/5
Therefore, the probability the marble is not red = 3/5
Learn more about probability here:
brainly.com/question/11234923
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