An automobile manufacturer claims that their van has a 46.4miles/gallon (MPG) rating. An independent testing firm has beencontracted to test the MPG for this van. After testing 140 vansthey found a mean MPG of 46.0. Assume the standard deviation isknown to be 2.6. Is there sufficient evidence at the 0.02 levelthat the vans underperform the manufacturer's MPG rating? Step 2 of5: Enter the value of the z test statistic. Round your answer totwo decimal places.
