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.
1 42% - I bought a ring on ebay that was listed as a sterling silver cz ring...but, inside the band is a mysterious diamond shape with the capital f in it,..? 2  28% - What does f1 mean on the inside of the gold band of the diamond ring? 3  62% - My diamond ring reads 28 on the inside of the band what does it mean?etty.mckenna said: The 14KP means that if you take the weight of the ring and divide it by 22 then multiply it by 14 that is the amount that is exactly 14KT of gold. The .85 can mean the weight of the stones on the ring.