Answer:
The 98% confidence interval for the mean purchases of all customers is ($37.40, $61.74).
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 M as such

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

The lower end of the interval is the mean subtracted by M. So it is 49.57 - 12.17 = $37.40.
The upper end of the interval is the mean added to M. So it is 49.57 + 12.17 = $61.74.
The 98% confidence interval for the mean purchases of all customers is ($37.40, $61.74).
Take 40.00 divide by 8 to pay 5.00 a bag
Answer:
True
Step-by-step explanation:
Some of our energy comes from electrical power plants
The sum of five and the quotient of two and four
because u do division first
Answer:
5
Step-by-step explanation:
Divide 10 by 2, the result of which is 5, this is the y coordinate of the midpoint