They are: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.
Their mean looks like 28 3/11 = 28.2727... (rounded, repeating)
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5,5
Any number can be an arithmetic mean. SO just pick any three numbers between -2 and 12. And if you want to find a set of numbers for which your selected number is a mean add 1 and subtract 1 from it, or add 2 and subtract 2 from it (or do both). Suppose you pick 8. Add 1 and subtract 1: 7 and 9. 8 IS the arithmetic mean of 7 and 9. Add 2 and subtract 2: 6 and 10. 8 is the arithmetic mean of 6 and 10. It is also the AM of 6, 7, 9 and 10.
10. It is what you get when you add the two numbers together and divide by two and it is the number that is halfway between the two numbers.
100
The arithmetic mean of 10, 11, and 6 is 9. Add them together then divide by 3.