100 + 300 + 500 + 500 + 600 = 2000. Then divide by 5 to get 400.
The mean of these five numbers is 400.
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100, 200, 300, 400, 500, 600, 700, 800, 900
300 Find the difference (500-100=400) then halve the sum(200). Add the halved sum to the lowest number in the equaion(100) or subtract the halved sum(200)from the largest number in the equation(500) one:500-100=400 two:400/2=200 Three: 200+100=300 or 500-200=300
600
The answer is 600.
4,700.