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A sprint duathlon consists of a 5 km run, a 20 km bike ride, followed by...

A sprint duathlon consists of a 5 km run, a 20 km bike ride, followed by another 5 km run. The mean finish time of all participants in a recent large duathlon was 1.67 hours with a standard deviation of 0.25 hours. Suppose a random sample of 30 participants in the 40–44 age group was taken and the mean finishing time was found to be 1.62 hours with a standard deviation of 0.40 hours. What is the standard error (or estimated standard error) for the mean finish time of 30 randomly selected participants in the 40–44 age group?

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