Also, you have skewed your numbers....9300 average subs and 11,800 subs does not indicate that 2500 subs have been added ion the last month! There is a difference between an average sub number and stating that you have 11,800 subs.....
it would indicate that they added 11,800-11,800 * (churn %)= number of average subs at end of month.
The churn given for the three months of Q3 is listed at 12.4% or 0.1240 that means that 1463.4 subs are expected to fall out based on churn....11,800-1463 is equal to 10,337 average subs or a gain of 1037 by the end of the month or so.....I am pretty confident my math is currect...but please feel free to correct it if it is wrong...
Of course the key is that no one can be sure what percentage of those 1037 average subs were obtained from the bus tour?