Solution: We are given below data:

Now to find the mean deviation, we use the below formula:

Where:
represents the summation
X, represents the observation.
represents the mean
N represents the number of observation.


Therefore, the mean deviation is:

= 4
We know that 4 cans of coffee cost $1.60. So, if we divide that number by 4, we get

Now we can simply repeat this process again: if we divide both sides by 4, we get

Hi there
dollar amount of each monthly payment is interest
11,798.81÷120
=98.32
percent of the total payments is total interest
(11,798.81÷41,798.81)×100
=28.23%
Hope it helps
She is not correct because the absolute value of -2 is 2 and the absolute value of 2 is 2