Naoko Is a 47-Year-Old Female

Multiple Choice

Naoko is a 47-year-old female. She is about to begin a physical activity program and knows she should use the percentage of her maximum heart rate to determine the intensity she should exercise at. Naoko's calculated maximum heart rate is:

A) 141 beats per minute.
B) 153 beats per minute.
C) 173 beats per minute.
D) 198 beats per minute.