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Find the Mean : Add all the numbers and divide by how many there are: 
Find Differences from the Mean : Subtract the mean from each number and square the result: 
Find the Average of the Squared Differences: Add these squared differences and divide by the number of values:
25 30 300 315 6300 ?
...50 62 ? 96 126 138
...48 24 72 18 90 ?
17 26 37 �...
18 29 51 84 128 182
231 451 671 242 485 264
...3720 3842 ? 4092 4220 4350
...Direction: Which of the following will replace ‘?’ in the given question?
5, 18, ‘?’, 126, 296, 586, 1044
24 47 137 ? 2679 16049
...61 48 ? ...
