For a given running event, a table of points are associated with times. For
example:

Time Points
----------------
2:16 150
2:00 200
1:48 250
1:38 300
1:29 350
....
0:50 1200

What is the easiest approach to calculate the points for a time that falls
between two times in the table? A simple staightline interpolation within a
subrange is more than adequate. In other words, a performance of 2:08 falls
in the middle of the range 2:16 to 2:00, so the points would be in the
middle of 150 to 200, or 175 points.

Best,
Christopher