Answer:
They are perpendicular
Step-by-step explanation:
Answer:
11.57
Step-by-step explanation:
We have a simple formula to solve this:

where
SS is sum of squares
s^2 is the variance, and
n is the number of data points
We are given all the info to find out s^2. Hence,

Answer:
8
Step-by-step explanation:
40 x 0.20
= 8