A quality control technician uses a scintillation counter to monitor the beta radiation emitted by a sample of potassium chloride. Constant background radiation has already been accounted for and subtracted from the readings.
The table below shows five consecutive counts recorded over identical 5-second intervals.
| Interval | Recorded count |
|---|---|
| 1st | 412 |
| 2nd | 385 |
| 3rd | 421 |
| 4th | 398 |
| 5th | 409 |
Explain how the data in the table demonstrates that radioactive decay is a random process.