An automobile manufacturer has given its van a 47.2 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this van since it is believed that the van has an incorrect manufacturer's MPG rating. After testing 250 vans, they found a mean MPG of 47.0. Assume the population standard deviation is known to be 1.9. A level of significance of 0.02 will be used. A. Find the value of the test statistic.
B. State the null and alternative hypotheses.

A

The  test statistics is  

B

The  Null and  Alternative hypothesis are

        and  

Step-by-step explanation:

From the question we are told that

    The population mean is  

    The sample size is  

     The  sample mean is  

      The sample  standard deviation is  

      The level of significance is  

Given that the value which the manufacturer gave the automobile is  47.2 and  it is believed that this is not correct, then  

The  Null Hypothesis is  

The alternative Hypothesis  is  

The test statistics can be mathematically evaluated as  

substituting values

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer

answer: 1,380

step-by-step explanation:

1: you turn %15 into a decimal by moving the decimal point two places to the left.

2: and then you multiply .15 by 1,200 , which will get you 180.00

3: from there you will add 180 to 1,200

4: which will get you 1,380

hope it *im kind of slow so idk if my answer is right*