SOLUTION: a box contains 6 red pens and 4 blue pens. A pen is selected at random the colour is noted and the pen is returned to the box. this procedure is performed a second and then a third

Question 778402: a box contains 6 red pens and 4 blue pens. A pen is selected at random the colour is noted and the pen is returned to the box. this procedure is performed a second and then a third time. find the probability of obtaining 3 red pens
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a box contains 6 red pens and 4 blue pens. A pen is selected at random the colour is noted and the pen is returned to the box. this procedure is performed a second and then a third time. find the probability of obtaining 3 red pens
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Ans: Since the pen is replaced after each selection the selection
probabilities are independent.
Ans: P(3 red with replacement) = (6/10)^3 = 0.027
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Cheers,
Stan H.
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