Question

An urn contains 5 red and 2 black balls.Two balls are randomly selected.Let X represents the number of black balls.What are the possible values of X?Is X a random variable?

Answer 1

There are two balls may be selected as BR,RB,BR,BB,where R represents red ball and B represents black ball.
Variable X has the value 0,1,2 i.e.,there may be no black ball,may be one black ball or both the balls are black.
Since,X is a number whose values are defined on the outcomes of a random experiment,therefore,X is a random variable.