This is for SCIT-sessions 24 October, 2018
Generally for random the propability of picking a number from an iteratble is same for every element.
But in case of numpy.random.poisson() the propability of picking a number follows poission distribution Similarly, numpy.random.normal() the propability of picking a number follows normal distribution
The average of the part of above that is random taken subset will still provide the actual mean with a very little uncertanity.