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: Recall Binomial Experiment Trials

In a binomial experiment, the number of trials (\(n\)) is the number of independent and identical observations (here, polling people).

Step2: Identify Trials from Problem

The researcher polls 250 people. Each poll is a trial. So the number of trials is 250.

Answer:

250 (corresponding to the option with "250" as the value)