Summary of Descriptive statistics and probability

Summary

A measure which divides an array into four equal parts in known as quartiles.

A measure which divides an array into ten equal parts is known as deciles.

A measure which divides an array into hundred equal parts is known as percentiles

Q₂ = D₅ = P₅₀ = Median

Inter quartile range = Q₃ – Q₁

The conditional probability of an event A given the occurrence of the event B is given by

Baye’s Theorem:

If E₁ , E₂ , E₃ ,..., E_n  are a set of n mutually exclusive and collectively exhaustive events with P(E_i) ≠ 0 (i =1,2,3…,n)_n, then for any arbitrary event A which is associated with sample space    such that P(A) > 0, we have