Question

a researcher finds that 15% of all commuters in a metropolitan area take the train to work. the researcher polls 250 people in the area and asks them whether they take the train to work. what is the number of trials for the binomial experiment?
15
38
250
285

Explanation:

Step1: Define binomial experiment

In a binomial experiment, a trial is an individual observation. Here, each person being polled is a trial.

Step2: Identify number of trials

The researcher polls 250 people. So the number of trials is 250.

Answer:

250