Complete the below:
The credit score of a 35 applying for a mortgage is normally distributed with a mean score of 600 and a standard deviation of 100.
What credit score defines the top five percent of scores.
Within what range would 85% of credit score fall.
One hundred car tires are tested and the mean useful life comes out to 50,000 and the sample standard deviation is 5,000 miles.
Develop a 95% confidence interval for the mean useful life of all car tires.
Develop a 90% confidence interval?