______________________________________________________________________________ 3. Use a colon between independent clauses if the second clause summarizes or explains the first. A colon is used to introduce an idea that is an explanation or continuation of the one that comes before the colon. The colon can be considered as a gateway inviting the reader to go on. Look at these examples: Ben suddenly canceled his evening plans for a simple reason: his car was out of gas.
Measures of Center: Mean, Median, and Mode Measures of center generally tell us about the middle, or center, of a distribution. They are the mean, the median, and the mode. Each plays a useful role in Statistics. The Mean The mean, or arithmetic average, is calculated by adding all the data values and dividing by the number of values.
When to use the median. The median is a good measure of the average value when the data include exceptionally high or low values because these have little influence on the outcome. The median is the most suitable measure of average for data classified on an ordinal scale. The median is also easy to calculate but this does not imply that it is an inferior measure to the mean â what is important is to use an appropriate measure to determine the average.