The first quartile (Q 1) is defined as the middle number between the smallest number and the median of the data set.The second quartile (Q 2) is the median of the data. Use the median to divide the ordered data set into two halves. 2  If the median is a datum (as opposed to being the mean of the middle two data), include the median in both halves. 3  The lower quartile value is the median of the lower half of the data.
Many people associate shaky hands with Parkinsonâs disease, but the most common cause of shaking hands is actually essential tremor. Essential tremor is the most common neurologic disorder affecting adults, but itâs not well understood.
Top 10 facts about the world. Hand atrophy is a condition that causes muscles of the hand deteriorate and wither away. Also called muscle wasting, hand atrophy leads the muscles to begin to lose their bulk and strength. This in turn may cause a general decrease in the ability of the hand to move.