Answer:
c) .22
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 question:

Then



Answer:
3/8
Step-by-step explanation:
3/4*1/2=3/8
3/8*1=3/8
*=multiply
Answer:
Angle of depression
Step-by-step explanation: