Nuclear power: The following table presents the number of nuclear reactors as of August 2, 2013, In some countries that had one or more reactors. Country Number of Reactors Country Number of Reactors Argentina Мexico Armenia 1 Netherlands 1 Belgium 7 Pakistan Brazil Romania Bulgaria 2 Russia 33 Canada 19 Slovakia China 18 South Africa Czech Republic 9. South Korea 23 Finland 4. Sweden 10 Germany 9. Ukraine 15 Hungary 4 United States 100 India 20 Iran 1

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.