Statistics
 Range is the difference between the highest and lowest observations of the data.
Example: The runs scored by a batsman in 6 matches are as follows.
24, 126, 78, 43, 69, 86
What is the range of the scores?
Solution:
Highest score of the batsman = 126
Lowest score of the batsman = 24
∴ Range = Highest score – Lowest score = 126 – 24 = 102
 The mean of the squares of the deviations from mean is called the variance and it is denoted by s^{2}.
 Variance of Data:

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