Question

The probability of buying a movie ticket with a popcorn coupon is 0.608. If you buy 10 movie tickets, what is the probability that 3 or more of the tickets have popcorn coupons? (Round your answer to 3 decimal places if necessary.) Seen multiple "correct" answers for this. Utilizing the calculator on my exam I received .951. The exam shows it as .999 with some crazy by hand method. We were taught to use the calculator functions. Trying to see if i can fight that missed question. The exam is completed and automatically graded by 3rd party website.

Answer 1

Le X is a random variable shows the number of movie tickets have popcorn coupons. Here X has binomial distribution with following parameters

n=10 and p=0.608

We need to find the probability

Following is the screen shot of TI calculator: