Question

He following table shows the probability distribution for a discrete random variable. What is the variance of X?

Answer 1

Answer:

It is obvious that a discrete variable is a type of variable which is expected to take up any numeric values that are countable types only. So if I take the case of tossing a single coin, then it is obvious that I can only have two possible outcomes – one heads and one tails. Now under such circumstances where the variable can take only countable values, the variable is termed as being discrete.

Step-by-step explanation:

Now getting familiar with the word random used here, you need to remember that a variable is said to be random if after adding all possible values you get the sum that is equivalent to one. In other case, a random variable will always have a numerical value outcome that is generated by a random phenomenon.

So for discrete value X, it is expected to have all possible countable number values. In order to plot or graph the probability, you have to construct what is termed as a histogram.