It is the sum of the number which is then divided by 2.
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1/4
The answer is -32 Sum of -16+8 = -8 Half of -8 = -4 Sum of -5+9 = 4 Twice of 4 = 8 Product = 8*(-4) = -32
The mean is half of their sum.
It is the half of a sum. (0.5 is enough.)
If half of the sum is 90 then the full sum must be 180. The three consecutive multiples of 10 which add up to 180 are 50, 60 and 70.