Interpolate missing value for specific range

Hi, i have a data to sort by using linear interpolation.

Let’s say i have 

Age Value

1 5

2 6

3 11

4 13

5

6

7

8

9

and 5 to 9 is given the only the total value which is 32. How to fill the missing value for these by using linear interpolation? 

By: Maria

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