Can you show steps on solving the below questions

Fairfield Automotive is the local dealership selling Honda automobiles. It recently stated in an advertisement that Honda owners average more than 85,000 miles before trading in or selling their Hondas. To test this, an independent agency selected a simple random sample of 80 Honda owners who have either traded or sold their Hondas and determinedthe number of miles on the car when the owner parted with the car. It plans to test Fairfield's claim at the =0.05 level.

a.State the appropriate null and alternative hypothesis.

b.If the sample mean is 86,200 miles and the sample standard deviation is 12,000 miles, what conclusion should e reached about the claim.

Sanchez Electronics sells electronic components for car stereos. It claims that the average life of a component exceeds 4,000 hours. To test this claim, it has selected a random sample of n=12 of the components and traced the life between installation and failure. The following data were obtained:

a.State the appropriate null and alternative hypothesis

b.Assuming that the test is to be conducted using a 0.05 level of significance, what conclusion should be reached based on these sample data? Be sure to examine the required normality assumption.