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More Lessons for A Level Maths

Math Worksheets

A collection of videos, activities and worksheets that are suitable for A Level Maths.

**What is the meaning of Var(X) and how to calculate it for a discrete random variable?**

**The Expected Mean E(X)**

The meaning of this function, Expected Mean E(X), and how to use it to calculate the expected mean for a discrete random variable.
**Extending E(X) to E(X ± a) and E(aX)**

What these functions mean, and how to use them.

**Variance : Var(X)**

The meaning of Var(X) and how to calculate it for a discrete random variable.**Extending Var(X) to Var(X ± a) and Var(aX)**

I show you what these functions mean, and how to use them.**Why does Var(a)=0, Var(X ± a) = Var(X) and Var(aX) = a**^{2}Var(X)?

Non formal proof of these results.**The meaning and calculation of E(X**^{2})

In this tutorial I show you the meaning of this function and how to calculate it for a discrete random variable.

More Lessons for A Level Maths

Math Worksheets

A collection of videos, activities and worksheets that are suitable for A Level Maths.

The meaning of this function, Expected Mean E(X), and how to use it to calculate the expected mean for a discrete random variable.

What these functions mean, and how to use them.

The meaning of Var(X) and how to calculate it for a discrete random variable.

I show you what these functions mean, and how to use them.

Non formal proof of these results.

In this tutorial I show you the meaning of this function and how to calculate it for a discrete random variable.

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