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.
While most violins use the same types of tonewoodâspruce tops, and maple necks, backs and sidesâthe quality of the wood varies, which is reflected in the price differences between instruments. The top of the violin body is its soundboardâthe wood that amplifies the sound produced by the resonating strings.