Answer:
b
Step-by-step explanation:
sorry if its wrong:/
Answer:
The margin of error for a 99% confidence interval for the population mean is 1.8025.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find the margin of error M as such

In which
is the standard deviation of the population and n is the size of the sample.
In this problem:

So

The margin of error for a 99% confidence interval for the population mean is 1.8025.
Sales above monthly quota = 23800 - 17000 = $6800
So her commission = 0.05 * 6,800 = $340
Therefore her total salary for the month = 3600 + 340
= $3,940 (answer).