A manufacturer claims that the life span of its tires is 50,000 miles and the standard deviation is 800 miles. You work for a consumer protection agency and you are testing this manufacturer tires. You select 100 tires at random and found that the sample mean life span is 49,715 miles. Use a 99% confidence interval to test the manufacturer's claim. Assume the life spans of the tires are normally distributed.

i got 10.28 but that rounds up to 10.3

steve should create a type of business report called a business plan. the correct option among the options that are already given in the question is the last or the fourth option. this business report created by steve will actually influence the investors about investing their money in steve's business. this business report will have all the details about the business, the amount of investment required and the amount of expected profit.