Staking Rewards: Calculated by dividing the inflation rate by the staking ratio. Think of newly-minted NOM as a pie: inflation is the size of that pie. By staking, you're sitting at a table where fresh NOM is being served. Validators proportionately split the pie with everyone else at their table, so the more that others join, the smaller the slice of the pie is that you get. The bigger the pie, the more rewards everyone staking gets.
In other words, the total staking rewards are divided among a validator’s staking pool according to each validator’s weight. Their rewards are then divided among delegators in proportion to each delegator’s stake. Note that validators may charge a commission on their delegators’ rewards before it is distributed.