# GCSE Statistics - Standard Deviation

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Standard deviation shows how spread about the data is about the mean.

Example:

Here's a set of data, for which I will calculate the standard deviation:

Here are the heights of 5 Irish leprechauns:

500cm, 650mm, 430mm, 410mm, 560mm.

Step 1: Firstly, find the mean:

• 500+650+430+410+560 = 2550mm
• 2550 ÷ 5 = 510
• The mean is 510mm.

Step 2: Secondly, find the difference between the data and the

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not that useful when your calculations are wrong mate, you divided 2550 by 6 instead of 5 :L

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Dannyboy1997 wrote:

not that useful when your calculations are wrong mate, you divided 2550 by 6 instead of 5 :L

Damn, I was half asleep when I made this, I never realised that! Going to have to change it all now! :L

EDIT It's correct now, can't believe I made such a stupid mistake! Anyway, the calculations are right now! :)

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the 500 cm should be mm, either that or the addition is wrong

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Thanks

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