PO - per os, orally
SID - once a day
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You receive 1 point in 1 month.
The answer would depend on what period of time you are wanting to express, but let us suppose, for example, the unit was years. You would write this as 15/12 of a year. You could then simplify this to 5/4 of a year or 1 1/4 years.
20 girls to 1 guy
16.5 is 1 standard deviation from the mean. If you add the mean of 14 to the 1 standard deviation of 2.5, the result is 16.5.
The first natural number is usually taken to be 1. The mean of one number is itself so the mean of the first natural number is 1.