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jt.mcrae
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What is the mean
 balance point of distribution
 = sum of data/total number of data values
 Written as
 _
 x or Ex/n

What is the Standard deviation
Is the spread of data around the mean
 s= square root of E(x mean)^{2}_{/n1or}
 s=r/4

What is is the 68%95%99.7% rule
 Normal distribution
 68% of data within one SD of mean
 95% of data within two SD of mean
 99.7% of data withing three SD of mean

What is standardising data
standard score (z)= data value mean/ SD
 positive score is above mean
 negative score is below mean
 0 is equal to mean

