#### Llama

##### Tank

- Joined
- Nov 8, 2004

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As far as my understanding goes, Standard Deviation (SD for short) is a measure of how spread data is from the mean of that data.

1) Is that right?

In this context, I have a group of results. The people have been asked to guess the correct size of an angle (It's 44). How, the results of these people are in a grouped frequency table. So, my questions are:

2) Can I use the actual angle size instead of the mean result, to get the SD from the actual size? (If that makes sense)

3) How do I do this using a grouped frequency table of results?

Help would be appreciated, i'm a bit of a Maths noob

Cheers, Llama