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That would be 50% of the range, so if the high was 100 and the low was 20 half the range would be 80/2 = 40. But 40 is not halfway between the high and low – you need to add it to the low to get the midpoint of the H-L range, ie 20+40 = 60.
Instead it would be much easier to use (H + L)/2 = 60. See Jonathan’s earlier post above.