Hello, students, I am Dr. Gajendra purohit and today I m going to present a new topic mathematical exception the mathematical expectation is of two type the random variable is discrete and continuous concept based on these topics you can go to my last video and check click on ' I' tab the concept is different for a continuous and discrete variable the formula is different I will teach you all my old videos are for engineering mathematics b.sc competitive exams like partial differentiation maxima and minima double integration curve tracing, curvature jacobian you can go through my videos what is the mathematical expectation if any question asked to you to find expectation you need to see that it is a continuous variable or discrete variable in 12th class you were asked to find out the expected value of mean and variance is different it was asked for discrete I will teach you both continuous and discrete if you were asked to find the variance the formula of variance is and students when I will teach you chapter of moments how to calculate the value of moments I will give you a basic idea of means and variance and hoe to calculate mean and variance in a discrete random variable and in a continuous random variable in my next video, I will tell you about moments and talk in-depth about moments moments about the mean , origin moments about any other point like these, we will find the value of variance let's see the question if the ace is count as 1 and face card 10 means king queen jack here comes jack queen king 10 to jack 10 to king and 10 to the queen 4 ace is there you have to find it's mean multiply them and then add this will be the answer and like this, we will calculate the mean and variance of a discrete variable now I teach you how to calculate mean and variance of a continuous variable let's take the question expected value and mean are the same this formula is of gamma function and you know that I have uploaded a video on gamma and beta you can check that video the formula is like this, we find the value of mean and variance like this, we will find the variance so topic I have taught you the mathematical expectation we have seen that definition of mean and variance in a continuous and discrete random variable and how to calculate mean and variance of a discrete random variable then the continuous random variable next, I will teach you moments, what are the moments how to calculate the value of moment's thank you so much for watching this video and students for engineering mathematics, B.sc, competitive exams, IIT engineering GATE and all the paper are uploaded here on videos you can see my videos like, share and subscribe to my channel press the notification the bell and connect with me and I will bring good content for you