Two percent of mobile phones produced at a factory are defective. Which of the following is a binomial experiment?
A. Selecting phones randomly until a non-defective phone is chosen
B. Selecting phones randomly until 200 defective phones are chosen
C. Selecting 200 phones randomly and recording whether each phone is defective
D. Selecting a group of phones randomly and recording the number of defective phones in the group
Answer (1)
The option that represents a binomial experiment is 'Selecting 200 phones randomly and recording whether each phone is defective' as it meets all the criteria, including having a fixed number of trials. The other options vary in the number of trials or outcomes, disqualifying them from being binomial experiments. ;
