# 1.2 The Expected Value and Variance of Discrete Random Variables

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An introduction to the concept of the expected value of a discrete random variable.

I also look at the variance of a discrete random variable. The formulas are introduced, explained, and an example is worked through.

This is an updated and refined version of an earlier video. Those looking for the original version can find it at http://youtu.be/OvTEhNL96v0.

### 8 Responses to “1.2 The Expected Value and Variance of Discrete Random Variables”

1. Srini says:

Hi, Great Videos. How did you simulate one million times and obtain relative frequency in the “novelty coin” example stated in the “An introduction to the concept of the expected value of a discrete random variable” ?

Srini

• JB says:

Thanks! All of my simulations and plots were done in R.

2. Alex says:

hi,

my compliments for the great videos! Have been teaching stats for the humanities (corpus linguistics) and recently found out about this great series and this semester am planning to refer to them in my class. Keep up with the good work! One suggestion would be to show us some videos about stat models for count data.

Thanks a lot again!

• JB says:

Hi Alex.

Thanks for the kind words! And thanks for the suggestion. I’ll keep it in mind when I get back to video production. (I’ll find the time one of these years!)

All the best.

Jeremy

3. Charlotte says:

Thanks for your videos! You are so helpful, JB. Thank you so much.
– Happy stats student (Charlotte)

• JB says:

You are very welcome Charlotte!

4. Brendan Wong says:

Hey JB,

These videos are amazing. Thank you for them!!

-Brendan

• JB says:

You are very welcome. And thanks!