The midpoint of these two points would be (2, 8)
To find the midpoint of any two points, simply take the average of the x's and then the average of the y's. This will create a point directly in between them. To take an average, add the points together and then divide by 2. We'll start with the x values.
X VLAUE
11 + - 7 = 4
4/2 = 2
Next we do the same for the y value.
Y VALUE
3 + 13 = 16
16/2 = 8
Now we can take these two answers and put them together for the ordered pair of (2, 8)