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 marimba is another type of percussion instrument with bars being arranged like that of a piano. This usually has a wider range of three to five. This musical instrument is usually played by using a mallet to strike its keys.ylophone vs Marimba. Both, xylophone and marimba, are musical instruments from the percussion family and for those of whom who had no formal music education will find it hard to tell the difference between xylophone and marimba since they look very similar.