APFIVE In a multistage experiment on a university campus, a researcher sets up a probability tree to compute the overall probability that a randomly chosen computer is infected by a virus. The tree uses the operating system percentages and the corresponding infection rates. What experimental mistake did the researcher most likely commit in this process?
Table 3: Campus Computer Data
| Operating System | Percentage | Virus Infection Rate |
|---|---|---|
| Windows | 60% | 3% |
| Apple | 30% | 2% |
| Linux | 10% | 1% |
(Note: The table summarizes the distribution of operating systems and virus probabilities.)
Incorrectly using faulty weights for each operating system, leading to an erroneous overall virus probability.
Erroneously multiplying probabilities of dependent events even though they are independent.
Neglecting to consider the independence of events between selecting the operating system and virus infection.
Interpreting the given percentages as counts rather than probabilities.
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