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CBSE Class 12-science Answered

A bag contains 2 red and 3 black balls . One ball is drawn and put back into the bag.This is done three times and everytime a red ball is drawn, it is counted as a success.Let 'X' denote the number of successes.is 'X' a random variable. Justify your answer
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
An experiment is called random experiment if it satisfies the following two conditions:

(i) It has more than one possible outcome.

(ii) It is not possible to predict the outcome in advance.

Here X has two possible outcomes, a success and a failure. It is also not possible to predict the outcome when a ball is drawn, in advance.So X is a random variable.
Answered by | 04 Jun, 2014, 03:23: PM
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