I believe it would be any number that is within the darkest shaded area. (-4,1) seems like it would be correct.
I would try using a table. It might work better.
Answer:
$54.26
Step-by-step explanation:
Convert the percentage into a decimal by moving the decimal point 2 places to the left or divide by 100.
This will give you .0825.
Multiply this number by $50 and add it to it
Answer:
-2, 5, 12, 19, 26, 33, 40, 47, 54, 61, 68, 75, 82, 89, 96, 103
18 would have to be the mean because of the average
