Fn key. Not to be confused with Function key. The Fn key, short form for function, is a modifier key on many keyboards, especially on laptops, used in a compact layout to combine keys which are usually kept separate. It is typically found on laptops due to their keyboard size restrictions.
For a finite set of numbers, the standard deviation is found by taking the square root of the average of the squared deviations of the values from their average value. For example, the marks of a class of eight students (that is, a population) are the following eight values:
A slightly harder, real life example: The average height for grown men in the United States is 70, with a standard deviation of 3. A standard deviation of 3â means that most men (about 68%, assuming a normal distribution) have a height 3 taller to 3â shorter than the average (67â73) â one standard deviation.f the standard deviation were 20, then some men would be much taller or much shorter than the average, with a typical range of about 50â90. For another example, each of the three groups {0, 0, 14, 14}, {0, 6, 8, 14} and {6, 6, 8, 8} has an average (mean) of 7. But their standard deviations are 7, 5, and 1.