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OpenStudy (anonymous):
Suppose a bag of marbles has 4 green, 2 red, 5 yellow, 1 brown, and 7 blue marbles. What is the probability of picking a yellow marble, replacing it, and picking another yellow marble?
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OpenStudy (amistre64):
how many yellows we got?
OpenStudy (anonymous):
5
OpenStudy (amistre64):
and how many marbles we got altogether?
OpenStudy (amistre64):
looks like 19 i think
OpenStudy (amistre64):
so P(y) = 5/19 by replacing the marble, none of the values change in the next pick soo P(y and y) = P(y) * P(y) = (5/19)^2
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