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So a more logical question involving the Random variable becomes, what is the probability that X is equal to 7. You come to the same results of knowing X must equal 7, however you're incorporating elements (The two dice) which no longer can simply be substituted with a fixed number. For instance, with normal variables, if I want to know what the variable x must be to make y = 0 in the function y = x -7, you simply plug in numbers and find that x must equal 7.īut if you wanted to say X = the sum of two six-sided dice, but put it in the same equation, so y = X -7.
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You can't determine what the result is, rather you can express probabilities of certain outcomes. The term "random" in random variable really says it all. However they are fixed values which can be solved. If the absolute value of x minus four equals zero, then both negative four (-4) and positive four (4) are correct. Well, variables don't have to be single numbers. of people, we cannot have 2.5 or 3.5 persons and Continuous can have decimal values e.g. Discrete which cannot have decimal value e.g. There can be 2 types of Random variable Discrete and Continuous. I hope this explains the concept of random variable. So you see we are getting random faces up for the dice and we cannot predict if on the next roll it would be 3 or 5 or 6 or 2 or whatever. Now let's say on first roll we get 2 then on subsequent rolls 4 then 5 then 6 and so on. To make it simpler further let's say here in example we are using roling of dice, so we cannot predict before hand which face would be up so it means random. So Random Variable means that for any event if you are calculating the value you may assign it to a variable randomly. As the word suggest that Random means any number (in mathematical terms) and variable means whose value can change all the time and takes up the value which you assign to it (in Computer science terms though context is same in both and maths).
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