Here is a simple "guesstimate" formula to track expected earning or performance...
The pool's hashrate is 276 GH/s, the network hashrate is 721 GH/s
276 / 721 = 0.3828 (38.28% of total power)
There are 1440 blocks mined/staked per day total.
0.3828.... * 1440 = 551.23 (blocks per day expected to be found by pool)