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 spinet piano is a smaller version of a piano. The term âspinetâ is actually used to refer to any smaller version of a larger instrument such as a spinet harpsichord or organ. Spinet pianos were manufactured between the 1930s and the late 1990s, when they fell out of fashion. The primary reason for the decline of the instrument was the inferiority of its sound.