Answer:
The value of the test statistic is -2.64.
Step-by-step explanation:
The test statistic is:

In which X is the sample mean,  is the expected(claimed) mean,
 is the expected(claimed) mean,  is the standard deviation and n is the size of the sample.
 is the standard deviation and n is the size of the sample.
An automobile manufacturer claims that its van has a 40.3 miles/gallon (MPG) rating.
This means that 
After testing 250 vans, they found a mean MPG of 39.9. Assume the standard deviation is known to be 2.4.
This means, respectively, that:

So



The value of the test statistic is -2.64.
 
        
             
        
        
        
Answer:
-30
Step-by-step explanation:
substitute the values and get -30
 
        
                    
             
        
        
        
Answer:
Answer is 5x+2
Step-by-step explanation:

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Answer:
8 yards < 10 yards
He has enough.
Step-by-step explanation:
1 yard = 3 feet
y yards = 24 feet

y · 3 = 1 · 24
3y = 24
3y ÷ 3 = 24 ÷ 3
y = 8
24 feet = 8 yards
8 yards < 10 yards