Can someone teach me how to solve this?

\\(ulul lulu u A used car salesman at Midlands Honda knows that 15% of potential buyers who test drive a vehicle will eventually buy a vehicle from him. If he takes a test drive with 12 potential buyers, what is the probability that at least 3 will purchase a vehicle from him? Assume that the number of test drivers who buy can be modeled by a binomial random variable. A A. .2501 A s. .092 A c. .736 A D. .264 QUESTION 4 Refer to Question 3. Find the mean and standard deviation of the binomial distribution with n :15 and p :2. A A. The mean is 1.5 and the standard deviation is 1.28 A- B. The mean is 2.0 and the standard deviation is 1.53 A C. The mean is 1.8 and the standard deviation is 1.73. A D.The mean is 1.8 and the standard deviation is 1.237