Can someone please help thanks

The Alvin Secretarial Service procures temporary office personnel for major corporations. They have found that 90 % of their invoices are paid within 15 working days. If a random samples of 12 invoices is checked, what is the probability that all of the invoices are paid within 15 working days ? Round your answer to 4 decimal places. The Alvin Secretarial Service procures temporary office personnel for major corporations. They have found that 90 % of their invoices are paid within 15 working days. If a random samples of 12 invoices is checked, what is the probability that at most nine of the invoices are paid within 15 working days ? Round your answer to 4 decimal places