It simply means to take the number and then take it to the closest whole number, (may be a fraction)
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The mean is when you find the average of a set of numbers by adding them together and dividing the sum by how many numbers were in the set. Your set of numbers were 75, 89, and 30. The mean of these numbers would be 64.66. Since the 6 is ongoing you would round it and it would end up as 64.7. In some cases though, you might need to round it to the whole number. If so the mean would be 65.
I assume you mean to round it up to the second decimal place - in which case - you would round it up to read 84.38
You can round up to 800 or round down to 790. There are good statistical reasons for rounding numbers ending in 5 in such a way that the previous digit is even. This would mean rounding up to 800.
100,200,300,400,500
To find numbers with a mean of 7, we need to consider the sum of the numbers and the total count of numbers. If we have two numbers, they must add up to 14 to have a mean of 7. For three numbers, their sum must be 21. In general, any set of numbers that sum up to 7 times the count of numbers will have a mean of 7.