healthy is around 101-135.
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A girl who is 4' 11" should be around 23-28 inches around, depending on your age.
1/4 inch per foot.
One inch of rain over one square foot is 1/12 cubic foot of water. A cubic foot of water weighs about 62.4 pounds. 1/12 of that is about 5.2 pounds.
I would say 125 pounds would be an average weight for a 5 foot 4 inch 13 year old
You can't say 'pressure per square inch. It's just 'pressure', which equals force per square inch. You divide the person's weight by the area of the foot in contact with the stairs to get the answer.