A tire manufacturer wants to estimate the average number of miles that may be driven in a tire of a certain type before the tire wears out. Assume the population is normally distributed. A random sample of tires is chosen and are driven until they wear out and the number of thousands of miles is recorded, find the 99% confidence interval using the sample data.

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a) (27.144, 33.356)

b) (27.256, 33.244)

c) (26.746, 33.754)

d) (-3.106, 3.106)

e) (26.025, 34.475)