Answer: 306.9
Step-by-step explanation: 3.1 x 11 = 34.1 x 9 = 306.9
 
        
                    
             
        
        
        
Step-by-step explanation:
Conversion a mixed number 5 3/2
 to an improper fraction: 5 3/2 = 5 3/2
 = 5 · 2 + 3/2
 = 10 + 3/2
 = 13/2
To find a new numerator:
a) Multiply the whole number 5 by the denominator 2. Whole number 5 equally 5 * 2/2
 = 10/2
b) Add the answer from previous step 10 to the numerator 3. New numerator is 10 + 3 = 13
c) Write a previous answer (new numerator 13) over the denominator 2.
Five and three halfs is thirteen halfs
Conversion a mixed number 3 6/7
 to an improper fraction: 3 6/7 = 3 6/7
improper fraction: 3 6/7 = 3 6/7
 3 · 7 + 6/7 = 21 + 6/7 =27/7
 
To find a new numerator:
a) Multiply the whole number 3 by the denominator 7. Whole number 3 equally 3 * 7/7
 = 21/7
b) Add the answer from previous step 21 to the numerator 6. New numerator is 21 + 6 = 27
c) Write a previous answer (new numerator 27) over the denominator 7.
Three and six sevenths is twenty-seven sevenths
Multiple: 
13/2 * 27/7 = 13/2 · 27/7 = 351/14
 
 
        
             
        
        
        
Step-by-step explanation:
1 gallons is about 3.785 litres.
Hence, the number of gallons in 50 litres is 50/3.785 ≈ 13.2.
 
        
                    
             
        
        
        
Answer: (60.858, 69.142) 
Step-by-step explanation:
The formula to find the confidence interval for mean :
 , where
 , where  is the sample mean ,
 is the sample mean ,  is the population standard deviation , n is the sample size and
 is the population standard deviation , n is the sample size and  is the two-tailed test value for z.
 is the two-tailed test value for z.
Let x represents the time taken to mail products for all orders received at the office of this company.
As per given , we have
Confidence level : 95%
 n= 62
sample mean :  hours
 hours
Population standard deviation :  hours
 hours
z-value for 93% confidence interval:  [using z-value table]
  [using z-value table]
Now, 93% confidence the mean time taken to mail products for all orders received at the office of this company :-

Thus , 93% confidence the mean time taken to mail products for all orders received at the office of this company : (60.858, 69.142) 
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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