Determine which of the given procedures describe a binomial distribution. Select one: A. Record the number of ear piercings in a group of 30

Question

Determine which of the given procedures describe a binomial distribution. Select one: A. Record the number of ear piercings in a group of 30 randomly selected college students. B. Observing that five out of the next ten customers at a hotdog stand order hot peppers given that the probability of ordering hot peppers is 0.18. C. Surveying customers leaving a hardware store until a customer responds that he or she spent more than fifty dollars.

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Khang Minh 3 years 2021-07-23T09:23:21+00:00 1 Answers 35 views 0

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  1. thienan
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    2021-07-23T09:24:37+00:00
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    Answer:

    B. Observing that five out of the next ten customers at a hotdog stand order hot peppers given that the probability of ordering hot peppers is 0.18.

    Step-by-step explanation:

    Binomial probability distribution

    The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

    P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

    In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

    C_{n,x} = \frac{n!}{x!(n-x)!}

    And p is the probability of X happening.

    Option A:

    No, since it is not the probability, or percentage of students that have ear pircings, it is the number, which can assume values larger than 1.

    Option B:

    Yes, since it is a probability, each customer is independent of other customers, and in each trial, there are only two possible outcomes. This is the correct answer.

    Option C:

    No, this is called inverse binomial, as we want to find the number of customers until one does something, not the probability of a number of customers doing something.

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