Answer
$10kg$
Work Step by Step
The mass of the lower leg is about 5 kg. And the mass of the upper leg is about 7 kg. So an order of magnitude estimate of a person's mass is 10 kg.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.