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.
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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.
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).
One set of numbers for which this is true is {8}.
to find the mean of a set of numbers you have to find the total sum of the data divided by the number of addends in the data.
a data set in this case can be any collection of numbers you choose. Say we define Set A = {1,2,3,4,5} The Median for Set A is 3. The mean is the sum of the numbers divided by 5 in this case. 15/5 = 3 is the mean of Set A.