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26 March, 09:15

Select all situations where a binomial distribution is a reasonable probability model for the random variable X.

A quarter is flipped 3 times to see how many times tails comes up on the coin.

A spinner that has one 10, one 20, one 30, and one 40 is spun 4 times to see how many times a 20 is spun.

A number cube that has 1 on 2 sides, 2 on 2 sides, and 3 on 2 sides is rolled 4 times to see how many times 3 is rolled.

Three marbles are pulled from a bag of 10 green and 10 blue marbles without replacing to see how many times a green marble is pulled.

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Answers (2)
  1. 26 March, 10:28
    0
    In many cases, it is appropriate to summarize a group of independent observations by the number of observations in the group that represent one of two outcomes, this means that there are two probably outcome for a problem or situation. Below are the answer to the above question:

    1. A quarter is flipped 3 times to see how many times tails comes up on the coin.

    2. Three marbles are pulled from a bag of 10 green and 10 blue marbles without replacing to see how many times a green marble is pulled.
  2. 26 March, 10:55
    0
    A binomial distribution can only be used when there are 2 possible outcomes, no more, no less.

    Looking at the situations given you are able to use a binomial distribution in 2 cases.

    First is the quarter being flipped 3 times. There are only two possibilities (Heads or Tails).

    Second is the 3 marbles being pulled out of the bag. There are only two types of marbles (Green and Blue).
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