Any set of numbers that contain them! For example, they belong to the set
{10, 11}
or {10, 11, sqrt(2), pi, -3/7},
or {10, 11, bananas, France, cold}
or all whole numbers between 3 and 53,
or counting numbers,
or integers,
or rational numbers,
or real numbers,
or complex numbers,
etc.
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There are an infinite number of sets of numbers. 9,10 an 11 9,9,10,11 and 11 9,9,9,10,11,11 and 11 etc, for example, is one family of sets of numbers.
There are 4 possible answers: (7, 7, 10, 13, 13) (7, 8, 10, 12, 13) (7, 9, 10, 11, 13) (8, 8, 10, 10 14).
For 8 9 9 9 10 11 11 12: σ=1.3562
If you look at the numbers you can see .22 has got more numbers than .2 so it must be bigger. Also .22 = 22/100 = 11/50 .2 = 2/10 = 10/50 11/ 50 is bigger than 10/50
There are 11 numbers from 10 to 20 if we include 10 and 20. Of those, only 16 is a perfect square. So the probability if 1/11 or .09 repeating.