Since the data set has an even number of values, there are two values in the middle: 9 and 11. Now we can see that the mode of the data set is 9, since 9 occurs 3 times, which is more than any other data point.
To find the mode and median of a data set, it is helpful to reorder the set from lowest to highest. To find the mean of this data set add together all of the values and divide by the total number of values. In this case, the median is found by taking the average of the two data points closest to the middle.įor example, suppose that the ages for a group of ten students were collected and are listed below: If there is an even number of data points, there will not be an exact middle. The median of a data set is the middle value in the set. It is possible to have more than one mode in a data set if several values occur the most.
The mode of a data set is the value that occurs most frequently in the data set. This can be found by adding together all of the values and dividing by the total number of values. The mean of a data set is the average value of a data set. We will consider several measures of central tendency below. Measures of central tendency help us to determine how data is distributed.
Let’s talk about some concepts that you will more than likely see on the test. This domain can be neatly divided into 3 competencies: These questions account for 14% of the entire exam. The Probability and Statistics domain has about 14 questions.