I posted the definitions for P10,P50 and P90 a little while ago in this thread
Those P figures don't actually represent the chance of recovering any particular volume of oil, rather they represent an estimated volume where in the case of P90 say, 90% of the other estimates are higher than that volume. For P50 that would be 50% of the estimates are higher and for P10 only 10% are higher.
Also, the mean isn't the same as the P50. If the NSAI report use the P50 rather than the mean that WHL have used that alone may cause some difference in the estimated volumes.
Yes, it can be a bit confusing but take a look at those diagrams I posted and they might makes things a bit clearer.
QFY Price at posting:
6.3¢ Sentiment: Buy Disclosure: Held
