a data survey representative calls phone numbers selected at tandom until someone answers. each call has a .22 probability of someone answering it. let N be the number of calls until someone answers.

What type of variable is N?

Binomial, geometric or neither?

Respuesta :

Since the number of trials is not fixed, N is neither a binomial or a geometric variable, it is an inverse binomial variable.

The sample is chosen at random, hence, the trials are independent, that is, each person has the same probability of answering it, hence N is not a geometric variable.

For it to be a binomial distribution, there needs to be a fixed number of trials, which there is not, hence, N is also not a binomial variable.

  • The distribution that counts the number of trials until x successes in the inverse binomial distribution, which means that N is an inverse binomial variable.

A similar problem is given at https://brainly.com/question/25644451

Answer: Geometric

Step-by-step explanation:

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