Answer: 0.15km/min and 0.3km in 2 mins
Step-by-step explanation:
Given Data:
Cyclists speed = 9km/hr
1. Some traveling 60 km/h is traveling one km/min
60/60= 1 km/min
Rate in km/min
= 9km/hr / 60min
= 3/20 km/min
= 0.15 km/min
Kilometers travelled in 2mins
= 2 / 60
= 1 / 30
= 9km/hr * 1 / 30
= 9 / 30 
= 0.3 km in 2mins
 
        
                    
             
        
        
        
Answer: IDK hope you get a good grade :0 SORRY
Step-by-step explanation:
 
        
                    
             
        
        
        
<h2>
Answer with explanation:</h2>
The confidence interval for population mean is given by :-
 (1)
                   (1)
, where  = sample mean
 = sample mean 
z* = critical value.
SE = standard error
and  ,
 ,  = population standard deviation.
 = population standard deviation.
n= sample size.
As per given , we have


n= 15
It is known that ring diameter is normally distributed.
 
 
By z-table ,
The critical value for 95% confidence  = z*= 1.96
A 99% two-sided confidence interval on the true mean piston diameter :
 (using (1))
     (using (1))

 [Rounded to three decimal places]
  [Rounded to three decimal places]
∴  A 99% two-sided confidence interval on the true mean piston diameter  = (74.020, 74.022)
By z-table ,
The critical value for 95% confidence  = z*= 1.96
A 95% lower confidence bound on the true mean piston diameter:
  (using (1))
    (using (1))
 [Rounded to three decimal places]
 [Rounded to three decimal places]
∴  A 95% lower confidence bound on the true mean piston diameter= 74.020