Unfortunately, without having read the particular text that this question is referring to, I can't guarantee the correct answer.
However...typically, the resting heart rate of the average adult is 60-100 bpm. This number can vary based on a TON of factors such as age, weight, height, level of activity, etc. The resting heart-rate of a professional athlete, for example, could lie lower than 60!
These numbers are also different for children younger than 12 years old.
