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 this binomial experiment?
15
38
250
265

Explanation:

Step1: Understand binomial trial concept

In a binomial experiment, each individual observation or measurement is a trial. Here, each person polled is a trial.

Step2: Identify number of trials

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

Answer:

C. 250