Question

binomial distribution
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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: Define binomial trial count

In a binomial experiment, the number of trials equals the total number of independent observations or polls.

Step2: Match to given data

The researcher polls 250 people, so this is the number of trials.

Answer:

C. 250