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.
FBF = Flashback Friday. #FBF is an acronym primarily used on Instagram, Facebook, Twitter, and Tumblr that stands for Flashback Friday. Users typically use the tag on photos of moments in their past, like last yearâs vacation or a childhood friend.
Report Abuse. TFR means transfer, check with your bank if you do not know the source, its imperative you do so. It may be case you have been paid back monies where your have paid too much over a long time on your direct debits to water companies or any one else.Good luck. was looking at my online bank statement-money has been paid in and i have no idea who from. Under the column that usually has DEB for example, it says TFR and the details say f/flow followed by some numbers.