firepropr85
15.07.2019 •
Mathematics
Answer ! 20 pts & brainliest a bag contains 15 marbles. the probability of randomly selecting a green marble is 1/5. the probability of randomly selecting a green marble, replacing it, and then randomly selecting a blue marble is 2/25 how many blue marbles are in the bag? a. 2 b. 3 c. 5 d. 6
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Ответ:
When we draw with replacement we have independent events and the probability of the conjunction is the product of the individual probabilities.
P(Green first & Blue second) = P(Green first) P(Blue second) = P(Green) P(Blue)
P(Blue) = P(Green first & Blue second) / P(Green) = (2/25)/(1/5) = 2/5
So 2/5 of the marbles are blue, (2/5)(15)=6 marbles
Choice D
Ответ: