30×30=900
900/112.5=8 cameras to cover
112.5×4=450
900-450=450 ft left uncovered
        
                    
             
        
        
        
Answer:
80
Step-by-step explanation:
78 is only 2 from 80 while it is 8 from 70
 
        
                    
             
        
        
        
Answer:
Answer is 6.23u because ,
 
        
                    
             
        
        
        
Answer:
0.8224
Step-by-step explanation:
Data
- standard deviation, sd: $10
- first value of interest, x1: $63
- second value of interest, x2: $90
z-score for x1:
z1 = (x1 - mean)/sd = (63 - 76)/10 = -1.3 
z-score for x2:
z2 = (x2 - mean)/sd = (90 - 76)/10 =  1.4
The  proportion of wrist watch prices are between $63 and $90 is:
P(z1 < z < z2) = P(z < 1.4) - P(z < -1.3)
P(z < 1.4) = 0.9192 (see first picture attached)
P(z < -1.3) = 0.0968 (see second picture attached)
P(z1 < z < z2) = 0.9192 - 0.0968 = 0.8224
 
        
             
        
        
        
Answer:
either 81 or 81.8
Step-by-step explanation: