Standard Deviation. Standard deviation is a statistical measurement of the variation in a set of data. Standard deviation indicates how much the values of a certain data set differ from the mean on average.tandard deviation is a statistical measurement of the variation in a set of data. Standard deviation indicates how much the values of a certain data set differ from the mean on average.
The salty taste you are experiencing could be due to many causes. It could be that you are dehydrated especially if you are taking a medicine such as a diuretic, or drinking too much cafienated drinks (coffee, coke.. etc).
Because salty foods can cause the body to retain water, which will show up on the scale as a temporary weight gain, it's best to watch your salt intake and focus on eating a healthy, balanced diet, full of fruits and vegetables, before, during, and after menstruation.