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.
MTBF (Mean Time Between Failure), MTTR (Mean Time To. Repair), MTTF (Mean Time To Failure) and FIT (Failure In Time) are ways of providing a numeric. value based on a compilation of data to quantify a failure rate and the resulting time of expected. performance. The numeric value can be expressed using any measure of time, but hours is the. most common unit in practice.