The probability that she will next take a red or a white marble from the bag is 23/42
Probability is the likelihood or chance that an event will occur.
Probability = expected/Total
Total outcome = 18 +15 + 11 + 8
Total outcome = 42
Pr(red marble) = 15/42
Pr(white marble) = 8/42
Pr( red or a white marble) = 15/42 + 8/42
Pr( red or a white marble) = 23/42
Hence the probability that she will next take a red or a white marble from the bag is 23/42
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