JRossSter

L(80) = (n+1)*(y/100) = (10+1)*(80/100) = 8.8.

Since L(80) is 8.8, you'd use interpolation:

P(80) = X(8) + [L(80) - 8]*[X(9) - X(8)] = 8 + (8.8 - 8)*(9 - 8) = 8.8.

Note that in this case L(80) = P(80) by mere coincidence - not always the case.

As mentioned earlier, refer to the example on page 376 L1V1R7. Good luck remembering the formula. Haha.



Edited 1 time(s). Last edit at Wednesday, May 11, 2011 at 11:11AM by Oyster.