Sometimes epiphora is not a result of excessive tear production but is a problem with tear drainage. Normally tears exit the eye through small holes called puncta, which leads to a duct called the nasolacrimal duct which empties out into the nose. This is why we have to blow our noses whenever we have a good cry.
Arithmetic (from the Greek á¼ÏÎ¹Î¸Î¼ÏÏ arithmos, number) is a branch of mathematics that consists of the study of numbers, especially the properties of the traditional operations between themâaddition, subtraction, multiplication and division.
The arithmetic mean is by far the most common average. It is the simplest to compute and the easiest to understand. In fact, most people are only familiar with the arithmetic mean; however, this is often inaccurate and misleading. To illustrate the arithmetic mean, consider the three bars below. The arithmetic mean is simply computed by adding the three heights together and dividing by three; the result is an average height of 3 feet. In many instances, this is the correct type of average to use. The arithmetic mean is best used in situations where: the data are not skewed (no extreme outliers)