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 Piano Dimensions. The modern spinet piano dimensions. The spinet is a small home keyboard-plucked stringed musical instrument which was invented in XV century. The modern spinet piano dimensions are the smallest among the existing pianos. The largest is the grand, then baby grand piano goes, upright or vertical, console and finally, spinet.