12+5+9+10=36/4=9
9 is the Mean of 12, 5, 9, and 10
To find the mean of something, add all the figures and then divide by the number of figures.
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eight the 5 numbers add up 6 + 6 + 9 + 9 + 10 = 12 + 18 + 10 = 40 then divide by that 5 so 40 / 5 = 8
The mean of those data points is 9.
You mean "What percentage is 90 million of 5 billion?" If so, [(90 x 10^6) x 100] / (5 x 10^9) = (9 x 10^9) / (5 x 10^9) = 9/5 = 1.8%
-9,-11,-8,-12,-10