Mathematics, 28.12.2019 01:31 rosarioemily580

The mean of a list of 80 numbers is 230. if four numbers 145,156,210, and 255 are added, what is the mean of the list of numbers?

i saw a same question but it wasn't answered correctly, since the answer for this question is 228.17, and i have to show how to get to that answer which i dont know how to do.

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The mean of a list of 80 numbers is 230. if four numbers 145,156,210, and 255 are added, what is the...

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