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 instrument is traditionally played with a variety of mallets, but the hardest mallets are avoided so as not to risk cracking the bars. An instrument called the xylorimba, or sometimes the xylo-marimba or marimba-xylophone, is a type of xylophone with a range that extends down into that of the marimba.he marimba is a truly beautiful instrument and it has been used in a remarkable range of music. I think for me the most interesting use has been in the looping music of various minimalist composers. The flat tone and percussive elements of the marimba make it uniquely suited to create hypnotic, droning patterns.