So we have a weapon with probability of working succesfully. We test weapons and the stockpile is replaced if the number of failures is at least one. How large must n be to have ?
a)Use exact binomial
b)Use normal approximation
I know we can use ...
And then normalise this distribution to the standard normal form something like:
If that is correct I have to solve that for n,.... how?
Also I doubt that rewriting is smart...