Please help with the questions below

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): 32 38 47 48 53 46 30 51 42 52 (i) 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 two decimal places.) X = months 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? single mean single proportion .05 (a) What is the level of significance? State the null and alternate hypotheses. . Ho: H = 48; H1ty # 48 Ho: p = 48; H1: p > 48 o Ho: p = 48; H1: p # 48 Ho: H = 48; H1: " > 48 Ho: p = 48; H1: p