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Add the two numbers together:
8.5 + 12.4 = 20.9
Divide the sum by the amount of numbers (2):
20.9 / 2 = 10.45
The mean is 10.45.
Add the two numbers together:
8.5 + 12.4 = 20.9
Divide the sum by the amount of numbers (2):
20.9 / 2 = 10.45
The mean is 10.45.