### How To - Variance & Standard Deviation

Hey Guys, today we do a quick intro on some basic terms and formulas that are used frequently in statistics

- Mode or Modal Value, Middle Value, Median, Variance and the Standard Deviation

We have a class of

Next comes what probably everyone did at least once in school; calculate the class average or our

Using the

The formula for

- Mode or Modal Value, Middle Value, Median, Variance and the Standard Deviation

We have a class of

**8 Girls**and**8 Boys**, so a total of**16 kids**. To get the**Modal Value (m)**and therefore represent the level of the whole class, we count how often each grade showed up - in our case 2 and 3Next comes what probably everyone did at least once in school; calculate the class average or our

**Middle Value**(a small X with a line over its top; sorry I can't write it out here .__. )Using the

**Median**is actually just being nit-picky, but good to know. In case your teacher breaks into your house in the middle of the night and wants to know... you will probably never use this one in your life**For uneven**: look for the middle number**For even**: look for the two middle numbers, sum them up and divide by 2 - that's your medianThe formula for

**Variance**may look difficult at first, but you just subtract…