Question
6. Below is the joint probability distribution of viral infection and strain in a population of...
6. Below is the joint probability distribution of viral infection and strain in a population of rats. Strain ! A B C Infected 0.25 0.19 0.03 Not infected 0.19 0.17 0.17 (a) If we randomly sample a rat, what is the probability it is infected with the virus? (b) If we randomly sample a rat, what is the probability it is of strain A? (c) What is the strain distribution among infected rats? (d) Are the random variables strain and infection independent?
| strain | A | B | C |
|
INFECTED |
0.25 | 0.19 | 0.03 |
| NOT INFECTED | 0.19 | 0.17 | 0.17 |
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