Standard deviation is the square root of variance, but variance is given by mean, so divide by number of samples. That is : 38.5/10 = 3.58. But standard deviation equals the square root of variance, so SD = the square root of 3.85 which is 1.96.
The virginal(s): The virginal, also called virginals, usually has a rectangular case with the keyboard across the wide side. As with the spinet, the strings run side-to-side relative to the player. Again, it saves on wallspace, and again they rate their own FAQ. Virginals were fairly early, 15th and16th centuries.
A chordophone is any musical instrument that makes sound when the strings vibrate or if the strings are stretched between two points. Examples are the violin and the guitar, s â¦ o no, they are not percussion instruments.erophones are musical instruments played by blowing air through  the object. These instruments are part of the percussion family.  Examples include apito or samba whistle, â¦ siren and slide whistle. Chris Tungpalan. 654 Contributions. No Drums, No Life.