Critical Value and TS score

Manufacturer claims that its MX200 tires last for more than 5 years before they need to replaced. To test this claim at 95% confidence interval you took a sample o__f 12 customers wh__o bought MX200 tires and found that the mean time of their tires was 6.25 years and a standard deviation of 1.5 years.

What is the critical Value (t-score) for this experiment

What is the test Statistics for this experiment

Is this a right,left,one,two tail hypothesis

Does it reject Fail to reject or there is no sufficient data to support the claim

Thank you