Question: Football Player Heart Rates. For a group of 22 college football players, the mean heart rate after a morning workout session was 86 beats per minute, and the standard deviation was 5. Find the 90% confidence interval of the true mean for all college football players after a workout session. If a coach did not want to work his team beyond it’s capacity, what would be the maximum value he should use for the mean number of heartbeats per minute?