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How do I find the probability?
A large bag of marbles contains an equal amount of red, orange, yellow, blue, and green marbles. Brody randomly selects 1 marble from the bag. Which of the following represents the probability of selecting a red, blue, yellow, or green marble?
A. 0.6
B. 0.9
C. 0.7
D. 0.8
2 Answers
- HuhLv 66 years ago
We don't know how many marbles are in the bag, but there are five possibilities: red, orange, yellow, blue, and green, so here we have sum of all of them is 100%
(1 / 5) + (1 / 5) + (1 / 5) + (1 / 5) + (1 / 5) = 1
Because this is "or" (notice that keyword) we calculate the sum of the four possibilities: red, blue, yellow, or green.
(1 / 5) + (1 / 5) + (1 / 5) + (1 / 5) = -----> = 4(1 / 5) = 4 / 5 = 0.80
If it was "and" we would multiply them.
