In the last exercise, you computed the probability for each mean (`mu`

) and SD (`sigma`

) combination. Using the `levelplot`

function from the `lattice`

package we can now visualize this 2D probability distribution:

```
levelplot(probability ~ mu * sigma, data = pars)
```

We could calculate all kinds of credible intervals and probabilities from this plot, but just eyeballing it:

- What is the most probable mean (
`mu`

) of the IQ of Zombies? Roughly how uncertain is the estimate of`mu`

?

50 XP

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