A study randomly selects 25 adult male athletes and measures the resting heart rate of each. They found the mean heart rate of the sample to be 64 beats per minute and a standard deviation of 2.5 beats per minute. It is safe to assume that the resting heart rates of male athletes follows a normal distribution.

Suppose that an interval estimate of (63.1445, 64.8555) for true mean was reported using the aforementioned sampled data. What is the confidence level of the interval?

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