The median height of 15 students in a class is 61 inches. which action would change the median?

Let's say the data set is:

a, b, c, d, e, f, g, 61, h, i, j, k, l, m, n

If we add another number,

a, b, c, d, e, f, g, 61, h, i, j, k, l, m, n, o

You can see the median changes. So adding another number would change the median. 

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X=y+4 is the answe