SOLUTION: what is the mean numbers of 7.8 and 9 I have tried to figure it out but can't

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Question 885911: what is the mean numbers of 7.8 and 9 I have tried to figure it out but can't
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
You have only two numbers.
There are only a few operations you can do.
What have you tried?