The solution to the problem is as follows:
Take the differences to look for a pattern.
7.875 - 7.75 = 0.125
7.75 - 7.5 = 0.25
7.5 - 7 = 0.50
It should be apparent that it is half the previous difference so
next in sequence will be 7.875 + (0.125 / 2) which is 7.9375
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