Estimate the expected value of random item drops across a sponsored stream session. Combine the number of eligible viewers, drop opportunities, success probability, and average item value to see the expected total value, expected successful drops, and value per participant. This is a probability-weighted planning estimate—not a promise of the actual outcome in any single event.
The no-drop probability for one participant is (1 − drop probability)opportunities.
Expected value is the long-run average economic value distributed if the same event were repeated many times. It does not predict the exact count or value of drops in one session.
Item value is user supplied. Use a consistent basis—cash value, marketplace value, or internal economy value—and do not mix them.
With 1,200 viewers, 3 opportunities, a 4% chance, and an $8 average item, the expected distribution is $1,152 from 144 drops.
Expected value is a long-run probability-weighted average. Random variation makes individual events differ.
Yes. It assumes the same probability applies independently to every opportunity.
Yes, if every item is valued on the same basis and you account for any relevant transaction fees separately.
Expected drops and expected value become zero, while the no-drop probability becomes 100%.
Calculate each tier separately and add their expected values, especially when probabilities and values differ substantially.
| Variable | Meaning | Unit |
|---|---|---|
| Participants | People eligible for every opportunity | People |
| Opportunities | Independent chances per participant | Count |
| Drop chance | Success probability for each chance | Percent |
| Item value | Mean value of one successful drop | Currency |