I have this problem and not sure which formula to use.
Would this be the Binomial formula? If so how do I go about performing on this equation.
Cheers
Calculate 1 - Pr(no errors). Assuming independence, Pr(no errors) is straightforward.
To calculate the other stuff, substitute the data into the forumulas you've been undoubtedly been given. (If you need more help, please show what you've done and where you get stuck).