Mean, Median, and Mode.

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Presentation transcript:

Mean, Median, and Mode

Averages Mean, median and mode are three kinds of averages. They can be the same answer for a particular data set or they can be different. When you read an article in a magazine and it says “the average…”, it is helpful to know what kind of average is being talked about.

Example: A family has children aged 3, 4, 5, 3, 6. find the mean, median and mode.

Mode Mode: the number that appears the most often. 3 appears twice the other numbers only once. 3 is the mode. A list can have more than one mode or no mode at all.

Median Median: The number in the middle of the list. First, put the numbers in order. 3, 3, 4, 5, 6 The number in the middle is 4. 4 is the median.

Median If a list has an even number of elements, the median is the mean of the middle two numbers. 2,3,4,5,5,6 4 and 5 are in the middle and the mean of those two numbers is 4.5

Mean: Mean is the kind of average you have used before. 1) Add the numbers. 3+ 3+ 4+ 5+ 6 = 21 2) Divide by how many numbers were in the list. There are 5 numbers in the list. 215 = 4.2

Example with Algebra Jack sent five packages last week with a mean weight of 4.1 lbs. The mode is 6lbs and the median is 3.5 lbs. The second smallest package is one pound more than the smallest. Find the weight of the two smallest packages.