Morgan City Fire Chief Sidney Pyro is concerned about the low efficiency scores that his firefighters receive at the state testing institute. Chief Pyro believes that these scores result because some firefighters are not in good physical condition. Pyro orders 75 randomly selected firefighters to participate in an hour of exercise per day. Another 200 firefighters have no required exercise. After 60 days, all firefighters are tested again by the state; the results are shown in the accompanying table. What can you tell the chief based on this information?

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Mean Standard deviation Exercise Group 745 31.4 No-Exercise Group 70.6 26.3