Answer:
Mean= 10
Step-by-step explanation:
Mean= Total value of data/Number of datas given
          =3+2+26+9/4
          =40/4
          =10
Mean= 10
 
        
             
        
        
        
First, I'd like to say that this question is flawed because the diameter of the spool changes as you pull the line out. Some would argue it's negligible I suppose.
At any rate, assuming there's a magic spool where the diameter doesn't change, let's find the cicumference so we can find the length of one wrap around the spool.
circumference = 2*pi*r = 2 * pi * 4cm = about 25.133 cm
Now if it turns 16 times we'll have 16 times the circumference.
16 * (25.133 cm)
= 402.128 cm
 
        
                    
             
        
        
        
Answer:
The percent of callers are 37.21 who are on hold.
Step-by-step explanation:
Given:
A normally distributed data.
Mean of the data,  = 5.5 mins
 = 5.5 mins
Standard deviation,  = 0.4 mins
 = 0.4 mins
We have to find the callers percentage who are on hold between 5.4 and 5.8 mins.
Lets find z-score on each raw score.
⇒  ...raw score,
   ...raw score, =
 =  
 
⇒ Plugging the values. 
⇒  
 
⇒  
  
For raw score 5.5 the z score is.
⇒  
   
⇒  
 
Now we have to look upon the values from Z score table and arrange them in probability terms then convert it into percentages.
We have to work with P(5.4<z<5.8).
⇒ 
⇒ 
⇒  
 
⇒  and
 and  .<em>..from z -score table.</em>
.<em>..from z -score table.</em>
⇒ 
⇒  
 
To find the percentage we have to multiply with 100.
⇒ 
⇒  %
 %
The percent of callers who are on hold between 5.4 minutes to 5.8 minutes is 37.21
 
        
             
        
        
        
Answer:
t=-2
Step-by-step explanation:
(t+9)20=140 
Distribute the 20
20t +180 = 140
Subtract 180 from each side
 20t +180-180 = 140-180
20t = -40
Divide by 20
20t/20 = -40/20
t=-2
 
        
                    
             
        
        
        
Answer:
x = 4
Step-by-step explanation:
8x = 32
/8
x = 4