Statistics, Machine Learning, Data Science, Central Limit Theorem, Sample.
(independently and identically distributed). This means all r.v.s A_1 to A_N are (a) Independent, meaning the value taken by A_i is not in any way affected by the value taken by A_j; (b) Identically distributed, meaning all A_1 to A_N have the same distribution. Since they all measure the age of a