200 m to 4 hours
200/4
50m/1hour
Answer:
a) 
b) The should sample at least 293 small claims.
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
, which means that the answer of question a is z = 1.645.
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.
(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?
They should sample at least n small claims, in which n is found when
. So







The should sample at least 293 small claims.
3 (x+7)
multiply 3 to both x and 7
3x+21
Answer:
is there a picture?
Step-by-step explanation:
2 x -6 equals 0. add 6 to both sides. divide both sides by two. x equals 3