Mean Calculation: To find the mean (average) of a set of numbers, we add all the numbers together and then divide by the number of numbers.Calculation: (0.2+0.8+0.9+0.9)/4
Adding Numbers: Adding the numbers together: 0.2+0.8+0.9+0.9=2.8
Dividing Sum: Dividing the sum by the number of numbers: 2.8/4=0.7
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