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The manufacturer of a sports car claims that the fuel Injection system lasts 48 months...

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The manufacturer of a sports car claims that the fuel Injection system lasts 48 months before it needs to be replaced A consumer group tests this claim by surveying a random sample of 10 owners who had the fuel injection system replaced The ages of the cars at the time of replacement were in months 23 44 47 48 53 46 30 51 42 52 USE SALT 1 Use your calculator to calculate the mean age of a car when the fuel injection system fails x and standard deviation s Round your answers to four decimal places x months x 44 2000 8 1993 x months II Test the claim that the fuel injection system lasts less than an average of 48 months before needing replacement Use a 5 level of significance What are we testing in this problem

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