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Statistics

Example of Mean : calcuate the mean of 5, 6, 4,1,3

Solution: N = 5
SX = 5+6+4+ 1+3 = 19
So, m = 19/5
= 3.8
Example of Median: The median of the numbers 7, 12, 2, 4 is;

(12+2)/2 = 7.5

variance and standard deviation

Assume x1 x2 x3 …… are given observations and assume x be their mean. Then the variance can be calculated as ;

s2 = (x1 – x )2 + (x2 – x) + ….+ (xn – x)
n

= S di2
n
here,
di = (xi – x )
hence,
s = S (xi – x)2 = S di2
n n

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