Please compute the answer of the following Problem
Problem-A computer manufacturer is having a quality control issue with one of its notebook computers - 10% of the units are inoperable upon arrive to the customer. A highly valued customer places an emergency order for 8 units to be rushed delivered overnight and ready for use in the morning. The manufacturer offers to ship 9 units instead of the 8 that were requested.
Part 1- What is the probability that the customer will still not have at least 8 working computers?
I need help to find the probability that the customer have eight working computers.