Question 583477: Determine the probability that in a class 23 students, two or more students have birthday on 1 january?
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! We know that the famous birthday problem states that for a group of 23 people, there is a ~50% chance that two of them have the same birthday. However we can't say that the probability that two of them have a birthday on 1 January is 50%.
One way to approach this is to say that the probability of any one student having a birthday on 1 January is 1/365 (ignoring leap years). We want two or more students, so the probability is given by
binomcdf(23, 1/365, 2, 23)
=0.00183
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