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.
Spinet Pianos The spinet piano is the smallest of the vertical pianos. The spinet piano has what is called a dropped action. The piano action is the part of the piano that transfers the force of striking the key to the hammer striking the string. In appearance the spinet and console pianos are very similar.