Answer:
Following are the solution to this question:
Step-by-step explanation:
Using formula:

In question (1):

In point a:

In point b:


In question (2):

In point a:

In point b:


The 3 question is incomplete, that's why it can't be solved.
Answer: 10/3
Step-by-step explanation:
Look at attachment
I'd say this high concentration is due to geological processes
Geological processes are things such as erosion, tectonic plate shifts, e.t.c.
Either a pecan or walnut means you add the probabilities together
20% plus 35% equals 55%
7 waitresses can serve 28 tables