What is Random Variable? #shorts #randomvariable #statistics #mathematics #economics #econometrics

Discrete random variable

Variance of a discrete random variable

Mean of a discrete random variable

A random variable is said to be continuous, if

A random variable is said to be discrete, if

The role of intervening variables teaching process of mathematics is

In an university, out of 120 students, 15 opted mathematics only, 16 opted statistics only, 9 opted for physics only and 45 opted physics and mathematics, 30 opted physics and statistics, 8 opted mathematics and statistics and 80 opted physics. By drawin Venn diagram, find the number of students who (i) opted mathematics (ii) opted statistics (iii) did not opted any of the above three subjects.

c.d.f F(x) of a continous random variable X is defined as .