A number of customers arrive at a cafeteria during lunch hour at an average rate of 0.025 per second. Find the probability that at most 3 customers will in any given minute

Novak Djokovic, one of the top male tennis players in the world, makes a successful first serve 53% of the time. If he serves 15 times, what is the probability that he gets exactly 9 first serves in? Assume that each serve is independent of the others.   Don't forget to identify the values of n, x, p, and q before computing. If the rate is given to you as a percent, remember to convert to decimal before using as your value for p. Use the binomial probability formula and write your answer as a decimal rounded to four places.

Assume that when adults with smartphones are randomly​ selected, 64​% use them in meetings or classes. If 9 adult smartphone users are randomly​ selected, find the probability that exactly 3 of them use their smartphones in meetings or classes. rounded to 4 decimal places if needed

A courier service makes an average of 500 deliveries a week, plus / minus 50. The manager wants to know the probability that, on average, between 490 and 510 deliveries will be made during the next 30 weeks. Write your answer to 5 decimal places.