We have events:

- a <span>student stays in the school's dormitory

- </span>a <span>student stays with family

- </span><span>a student receives As
and </span> probabilities:

We want to calculate the probability <span>that the student lives in the school dormitory given he </span><span>receives As so it will be </span>

. From the <span>Bayes' theorem we know that:

The only thing we don't know is

, but we can calculate it using the l</span><span>aw of total probability. There will be:

So our probability:

Answer D.
</span>
5 divided by 4=1.25 I think I am right
Answer:
Least: 1
Greatest: 9
1Q: 2.25
Median: 5.5
3Q: 6.75
Ascending order: 1,3,4,5,6,7,9,12
Answer:
19x + 20
I have a picture of my work here for an explanation