Q: What are first differences?

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In a sequence of numbers, a(1), a(2), a(3), ... , a(n), a(n+1), ... he first differences are a(2) - a(1), a(3) - a(2), ... , a(n+1) - a(n) , ... Alternatively, d the sequence of first differences is given by d(n) = a(n+1) - a(n), n = 1, 2, 3, ...

First,find the mean of the set. Then,find the differences between every item and the mean Square them Find the mean of the squared differences The square root of that is the standard deviation

0,1,1,2,3,5,8,13

If you want the differences between consecutive values, you'll quite naturally have one less difference than the actual numbers. You'll just have to leave one of the cells in the table blank.

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4,8,12,16,20

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