Mean, median, mode (1)
Transcript of Mean, median, mode (1)
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MeanMedianMode
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The average of a set of numbers, found by dividing the sum of the set by the number
of addends.
Mean
Think about when your grades are averaged in school.
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MeanHere is an example: 74, 91, 63, 92, 85
74 405 ÷ 5 = 81 91 63 92
+85 405
The mean of 74, 91, 63, 92,
85 is 81.
A calculator is very helpful.
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Now let’s try one together. Get your calculators ready.
Add these numbers: 100 + 85 +++ 90 75 85 =
435 is your total.
Now it is time to divide.
435 ÷ by how many numbers there are 5 =
Did you get 87?
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MedianThe middle number in a set of data
that are arranged in order.Think of monkey in the middle.
Who me?
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Here is an example: 1, 3, 4, 6, 7 median
The median of 1, 3, 4, 6, and 7 is 4.
Median
Which number is in the middle?21, 16, 38, 32, 25
Here is one for you to try. You have to put them in order first!
25
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The number or item that occurs most often in a set of data.
ModeWhen you think of mode, think
MOST.
Which fruit is there the most of?
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ModeHere is an example: 1, 3, 4, 4, 6 4 occurs most often.
The mode of 1, 3, 4, 4, and 6 is 4. Time for you to try one. Remember, put them in order first!
31, 21, 31, 21, 21, 21 21 is the mode since it occurs most often.
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Let’s listen to a song about all three!
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Let’s find the mean, median and mode
of these numbers.14 ,21 ,42 ,21 ,35 ,21 ,49
Mean – Remember this is the average.First, add the numbers. 14 + 21 + 42 + 21 + 35 + 21 + 49 = 203Next, count how many numbers you have.
7Then, we divide our total 203 ÷ 7.
Our mean is 29 !
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Median – Don’t forget this is the number in the middle.
17,19,21,21,21,33,42
A great strategy to help you is to mark out the numbers on the
end to get to the number in the middle.
X X
21 is the median!
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Mode – Remember this is the number or item that occurs the most.
17, 21, 42, 21, 19, 21, 33
What number was repeated the most?
21 is the mode!
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RangeIs the difference between the largest value and the smallest value.
Let’s go back through the slides to find the range of each set of data.
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http://www.quia.com/rr/51667.html
http://www.bbc.co.uk/schools/ks2bitesize/maths/activities/modemedianmean.shtml
http://www.bbc.co.uk/schools/ks2bitesize/maths/tests/modemedianmean.shtml
Let’s at some websites.