Averages & Spread A review of what we know/can remember about mean, median, mode and range. Adapted from MrBartonMaths.com.

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Presentation transcript:

Averages & Spread A review of what we know/can remember about mean, median, mode and range. Adapted from MrBartonMaths.com

What is the Mean? I’m not really sure What the MEAN is about Just add them all up And share them all out.

The Mean e.g. Find the mean of these numbers: To find the mean of a set of data you need to: 1. Find the total of all the data. 2. Divide the total by the number of data values. e.g. Find the mean of these numbers: 1) 55, 23, 54, 12, 87, 32 2) 1.3, -0.34, -2.6, 0.57, 85

What is the Mode? I don’t want to brag, I don’t want to boast, I am the MODE, I am the most.

The Mode The mode of a set of data is the most common or most popular value. The mode does not have to be a number. e.g. Find the mode of these two sets of data: 1) 95, 90, 91, 90, 89, 84, 90 2) a, b, c, b, c, b, a, b, a, c, c

What is the Median? I don’t know the rhyme, I don’t know the riddle, I am the MEDIAN, And I’m in the middle!

The Median The median is the piece of data in the middle. To find it you must first put all the data in size order. If you have two middle values, add them together and divide by two to get the answer. e.g. Find the median of these two sets of data: 1) 29, 25, 0, 32, 14, 22, 14 2) 3.2, -27, 8.65, 0.04, 22.3, -1.1

From largest to smallest, What is the Range? From largest to smallest, See how they change, Take them away, And I am the range.

The Range The range of a set of data is the biggest value take away the smallest. e.g. Find the range of these numbers: 1) 321, 554, 201, 438, 212, 545 2) 0.97, -2.213, -2.5, -1.1, 0.499