Use the binomial with p = 1/10000 and q =9999/10000 and n = 50.
The calculation is tedious but with a calculator can be done.
The normal approximation doesn't work very well for the probability of a single outcome (as opposed to a range).
Conor D.
asked • 02/15/19Probability of x's in N trys
What is the probability of two 1/10,000 events occurring within 50 attempts?
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