Answer:
The probability of a successful event is the ratio of the number of successful events to the total number of events. In this case, a successful event is selecting a red marble from the box. The total number of events is the total number of marbles in the box:
Red marbles/Total number of marbles
4/12 divide
=1/3
The probability of her selecting a red marble is 1/3
The distribution of the marbles is given as:
Red = 4
Green = 8
The probability of selecting a red marble is:
P(Red) =Red/Total
So, we have:
P(Red) = 4/(4 + 8)
Evaluate
P(Red) = 1/3
Hence, the probability of her selecting a red marble is 1/3
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