To calculate the Target Heart Rate for a 15-year-old, we can use the given formulas:
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Calculate the maximum heart rate: \[ \text{Max Heart Rate} = 220 - \text{age} = 220 - 15 = 205 \]
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Calculate the lower end of the Target Heart Rate (50%): \[ \text{Lower end} = 205 \times 0.5 = 102.5 \text{ bpm} \]
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Calculate the upper end of the Target Heart Rate (85%): \[ \text{Upper end} = 205 \times 0.85 = 174.25 \text{ bpm} \]
Now, rounding these numbers:
- Lower end: ~ 103 bpm
- Upper end: ~ 174 bpm
Thus, the Target Heart Rate for a 15-year-old is approximately 103 to 174 bpm.
The correct answer is: The Target Heart Rate for a 15 year old is 103 to 174.
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