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Not necessarily.
It is above average for a human. Average would be 90-110.
Using A Minor as an example, the half steps are between the second and third notes and the fifth and sixth notes.
It does not necessarily fall.
Depend on what exactly do you mean by 'common'. On one hand there are countless photon everywhere which has zero mass. But if you mean everyday objects, then zero weight of cause (free fall, space etc), as I don't think zero mass is even attainable at this scale.