Answer:
(a) σ² = 144
(b) s² = 12
Step-by-step explanation:
(a) Population variance σ² = ∑(X -
)² / N
The arithmetic mean 


σ² = 
= 
= 
= 
σ² = 144
(b) 

= 12
Answer:
5, 2, 1, 2, 5
Step-by-step explanation:
Answer:
You do 1/5 x 125 which equals 25
Step-by-step explanation:
Answer:
$153
Step-by-step explanation:
180 * 0.85 = 153
Answer:
13.5
Step-by-step explanation:
12/4=3
9/3=3
4.5x3=13.5