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.
Best Answer: definite pitched drums, such as the smare, bass, and auxillary (triangle, tambouring, cymbals) are all instruments that, as the name implies, cannot change pitch. the drums can be tightened however. indefinte are those, such as the marimba, chimes, and timpani, are instruments that can change pitch/ notes. thats pretty much it.