The standard error of the mean is 128.125.
The formula for standard error is:

With our information, we have:
1. 4 5.-22 9.-60 13.-85
2.-7 6.-33 10.33 14.-21
3.-36 7.87 11.-78 15.-23
4. 78 8.55 12.24 16.149
Octagons have 8 sides. If each side is 5 feet then the perimeter is 40 feet. You add up the sides.
Answer:
x = 24
Step-by-step explanation:
27 x 4 = 108
18 x 3 = 54
9 x 2 = 18
108 - 54 + 18 = 3x
72 = 3x
72/3 = x
24 = x
-5(-2)+1
10+1=11
Your answer is C