The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a population standard deviation of 8.65 minutes, construct a 99% confidence interval for the true...

The average time taken by a sample of 68 runners to complete a 10km race was 42 minutes. Assuming a population standard deviation of 8.65 minutes, construct a 99% confidence interval for the true average time taken by all runners to complete the race. Interpret your answer.