Say we have a bunch of numbers like 9, 2, 5, 4, 12, 7, 8, 11. To calculate the standard deviation of those numbers: 1  1. 2  Work out the Mean (the simple average of the numbers). 3  2. Then for each number: subtract the Mean and square the result. 4  3. Then work out the mean of those squared differences.5  4. Take the square root of that and we are done!o calculate the standard deviation of those numbers: 1  1. 2  Work out the Mean (the simple average of the numbers). 3  2. Then for each number: subtract the Mean and square the result.
Best Answer: The .925 does mean sterling silver and the FB may be a Hallmark. You did not state what is on the medallion so I don't know where it was made. On some silver items the FB stands for Franz Bibus a Czech silversmith.
  HB refers to the hardness of the pencil. In the scale H is used for harder pencils (H for hard) HH HHH HHHH all get progressively harder, and B (the B stands for black) â¦ BB BBB BBBB get progressively softer. HB pencils (#2 on the US pencil-hardness scale) are right in the middle, so the HB stands for Hard Black.f you mean what HB stands for, it's an indicator for the hardness (H) or softness (B) of the graphite and clay used. However, the B is for blackness so HB is like average/m â¦ edium grade so the full form would be Hard Black, Hard and Black, or Hard Blackness.