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.
The cello (/ËtÊÉloÊ/ CHEL-oh; plural cellos or celli) or violoncello (/ËvaÉªÉlÉnËtÊÉloÊ/ VY-É-lÉn-CHEL-oh; [vjolonËtÊÉllo]) is a bowed string instrument with four strings tuned in perfect fifths. It is a member of the violin family of musical instruments, which also includes the violin and viola. The cello is used as a solo musical instrument, as well as in chamber music ensembles, string orchestras, as a member of the string section of symphony orchestras, and some rock bands. It is the second-largest bowed string instrument in the modern symphony orchestra, the double bass being the largest.