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31 October, 16:37

4. Five marbles are randomly selected with replacement. The probability that a black marble is chosen is 15%.

A. What is the probability that at least 2 marbles are black?

P (at least 2 black)

Not multiple choice sadly

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  1. 31 October, 19:27
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    Answer: You have a 16.49% percent chance of having at least 2 black marbles.

    This is an example of a binomial distribution. We have an event (drawing a black marble) that is only 15% likely. Out of 5 chances, we need to determine the likelihood that this occurs at least two time.

    You can look up these values on a Binomial Distribution table.

    We had to add up the percents for drawing 2, 3, 4, or 5 black marbles.

    2 - 0.1382

    3 - 0.0244

    4 - 0.0022

    5 - 0.0001

    Adding up these values gives us 0.1649.
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