Define mean, median, and mode

Mean, median, and mode are three kinds of "averages" in statistics that measure the center of a data set.

1. Mean: The mean, often referred to as the average, is calculated by adding all the numbers in the data set and then dividing by the number of values in that set. For example, if you have the numbers 1, 2, 3, 4, and 5, the mean would be (1+2+3+4+5)/5 = 3.

2. Median: The median is the middle value in a data set when the numbers are arranged in ascending or descending order. If there is an even number of values, the median is the average of the two middle numbers. For example, in the set 1, 2, 3, 4, 5, the median is 3. If the set was 1, 2, 3, 4, the median would be (2+3)/2 = 2.5.

3. Mode: The mode is the number that appears most frequently in a data set. A data set may have one mode, more than one mode, or no mode at all. For example, in the set 1, 2, 2, 3, 4, the mode is 2 because it appears twice, more than any other number.