Answer:
The correct option is b.
Step-by-step explanation:
The formula for standard deviation is
where, 
is mean of the data and n is number of observation.
The variance of a stock's returns can be calculated by the above formula.
Variance of stock's returns is the average value of squared deviations from the mean.
Therefore the correct option is b.
Answer:
-1, 0, 1, 2
Step-by-step explanation:
-1 + 0 + 1 + 2 = 2
3x + 4 = 2x + 2
3x - 2x = 2 - 4
x = -2
one solution
Answer:
3
Step-by-step explanation:
Same as: 8.5-5.5 = 3
Figure D could be formed from the net.
(bottom right)
-Because-
The net says that the middle shape (the bottom face) is 14 long, and it is 8 tall. So the only option that makes sense is the bottom right!
<em>feel free to mark brainliest! :)</em>
