A worker has 12machines. Every T time, he has a 1/3 change to configure each machine (Each machine has independent chance).What is the probability that he will configure 2 machines in the next T time?

Answer 1

You need to use a binomial distribution for this

If you have a TI-84 calculator, go to 2nd - VARS (DISTR) and scroll down to binompdf. Type in 12 for the trials, 1/3 for the probability, and 2 for the x value.

You will get 12.72%