The customer service department for a cell phone company claims that 90% of all customer complaints are resolved to the satisfaction of the customer during after filing a complaint with a customer service manager. A random sample of 12 customers who have filed complaints is selected.
This is a binomial distribution, with n=12 and p=0.9. You can calculate these probabilities either from a binomial table, or with the binomial formula. I used the table. If you used the formula, your answers may have more decimal places, depending on where you rounded, this is totally fine.