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Answer (Choose 1 answer)
The life of a car tire in miles is known to be normally distributed with a standard deviation of 25 miles. A random sample of 81 tires has an average life of 1025 miles. Construct a 95% upper confidence interval on the mean life. (Calculations need to be rounded to 4 decimal places.)Let z_0.025 1.96; z_0.05-1.645; z_0.005-2.575.
Α. με 1029.5694
Β. 1019.5632 ≤ μ≤ 1030.4459
C. 1020.4366 ≤ μ
D. με 1030.4459
