Hello,
In my old memories,
p(μ-2σ<=X<=μ+2σ)=95%
p(μ-3σ<=X<=μ+3σ)=99%
1000-2*200=1000-400=600
1000+2*200=1000+400=1400
Answer A
        
             
        
        
        
Standard Form:
68,020
Expanded Notation Form:
  68,020	=
  60,000  
+	8,000  
+	0  
+	20  
+	0  
Expanded Factors Form:
    68,020	=
  6 ×	10,000  
+	8 ×	1,000  
+	0 ×	100  
+	2 ×	10  
+	0 ×	1  
Expanded Exponential Form:
  68,020 =
        6 × 10^4
+	8 × 10^3
+	0 × 10^2
+	2 × 10^1
+	0 × 10^0
Word Form:
68,020 =
sixty-eight thousand twenty
 
        
             
        
        
        
Answer:
you need a ruler to measure to draw by using the measurements or number giving to you