Review the Mean, median, and mode

Mean, median, and mode

Mean, median, and mode are different measures of center in a numerical data set. They each try to summarize a dataset with a single number to represent a "typical" data point from the dataset.
Mean: The "average" number; found by adding all data points and dividing by the number of data points.
Example: The mean of 4, 1, and 7 is left parenthesis, 4, plus, 1, plus, 7, right parenthesis, slash, 3, equals, 12, slash, 3, equals, 4.
Median: The middle number; found by ordering all data points and picking out the one in the middle (or if there are two middle numbers, taking the mean of those two numbers).
Example: The median of 4, 1, and 7 is 4 because when the numbers are put in order left parenthesis, 1, 4, 7, right parenthesis, the number 4 is in the middle.
Mode: The most frequent number—that is, the number that occurs the highest number of times.
Example: The mode of left brace, 4, 2, 4, 3, 2, 2, right brace is 2 because it occurs three times, which is more than any other number.
Want to learn more about mean, median, and mode? Check out the more in-depth examples below, or check out this video explanation.

Calculating the mean

There are many different types of mean, but usually when people say mean, they are talking about the arithmetic mean.
The arithmetic mean is the sum of all of the data points divided by the number of data points.
mean=sum of data# of data points
Here's the same formula written more formally:
start text, m, e, a, n, end text, equals, start fraction, sum, x, start subscript, i, end subscript, divided by, n, end fraction

Example

Find the mean of this data:
1, 2, 4, 5
Start by adding the data:
1, plus, 2, plus, 4, plus, 5, equals, 12
There are 4 data points.
start text, m, e, a, n, end text, equals, start fraction, 12, divided by, 4, end fraction, equals, 3
The mean is 3.

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