In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean of the set, while a high standard deviation indicates that the values are spread out over a wider range.
Answer:


Step-by-step explanation:
Given

Required
Evaluate

Separate each factor with multiplication sign

Express 8 as 4 * 2 and
as 

Split each factor

Evaluate 

Apply law of indices:


Reorder





Hence:


I have no idea. Where is the diagram.
Answer:
r≈7ft
Step-by-step explanation:
C=2πr (π is pi)
r=C
2π=43.96
2·π≈6.99645ft
Y = 4x -9
y = x-3
Replace the "y" in above equation by x-3
x - 3 = 4x - 9
-3x = -6
x = 2
Then replace x = 2 to the beneth
y = 2 - 3 = -1