The following video clearly describes how to find the mean and the standard deviation of a set of data. You may watch more than once to get a clear idea of the use, after which it will become quite natural to you.
Mean, μ = Σx/n where n is the number of data; Standard Deviation, σ = Σ(x-μ)2/n
The following video clearly describes how to find the mean and the standard deviation of a set of data in a table. You may watch more than once to be familiar with entering data in a table.
Mean, μ = Σfx/Σf where f is the number of data of each class; Standard Deviation, σ = Σf(x-μ)2/Σf
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The major categories are for core mathematics, statistics, mechanics and trigonometry. Under each category, the tutorials are grouped according to the academic level.
This is also an opportunity to pay tribute to the intellectual giants like Newton, Pythagoras and Leibniz, who came up with lots of concepts in maths that we take for granted today - by using them to serve mankind.
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