When some says that it is all the same they mean that it is not surprising. These people have seen similar situations.
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The "mean" and the "average" of a bunch of different numbers are the same thing. It's the number that they would all have to be if they were all the same number and added up to the same total that they do now.
All sides are the same length.
Not at all.
All sets of 3 consecutive numbers will have the same mean and median
In a normal distribution the mean, median and mode are all the same value.