Question

Which of the following are binomial experiments? (more than one is possible)

1.) A store finds that 32% of people who enter the store will make a purchase. During a day, 50 people enter the store. The random variable represents the number of people who don't make a purchase.
2.) A jar contains 5 blue marbles, 6 green marbles, and 3 red marbles. You randomly select 2 marbles from the jar without replacement. You repeat that step. The random variable represents the number of red marbles that you select.
3.) A state lottery randomly chooses 6 balls numbered 1-40. You choose 6 of the 40 numbers and purchase a lottery ticket. The random variable represents the number of matches on your ticket to the numbers drawn in the lottery.
4.) A surgical procedure has a 76% chance of success. A doctor performs the procedure on 12 patients. The random variable represents the number of successful surgeries.