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Data handling Data handling
Thursday
Objectives for todayObjectives for today
• Extending our knowledge of statistics – range, mode, median and the mean.
•Today we are focusing on
finding the modemode and the
rangerange.
Learning objectives for today
• To be able to explain what the words modemode and rangerange mean.
• To be able to findfind the modemode and the rangerange of a set of data.
Recap on vocabularyRecap on vocabulary
Today we are going to learn what this word means?
Recap on vocabularyRecap on vocabulary
The mean is the average value
Finding the MEANFinding the MEAN
10 20
15We work this out by adding the
numbers together and dividing thatnumber by the total number
of values in the data set.
Now try these!Now try these!3 5 7 =
4 12 10 16 =5 10 15 10 20 =
The mean may not beone of the values.
Recap on vocabularyRecap on vocabulary
What does the word mean?The difference between the
smallest and the largestlargest number.
Is the most common.
Vocabulary explained
• The RANGE is the difference between the highest number and the lowest number in a set of data. It tells us how spread out the data is.
• The MODE is the most common number in a set of data.
• Both these are called STATISTICS.
Weights of newborn babies
What is the range of weights? What is the modal weight?
9 pounds
10 pounds
8 pounds
6 pounds
8 pounds
4 pounds4 pounds 8 pounds8 pounds
QuestionsQuestions
Shoe sizes
What is the range of shoe sizes? What is the modal shoe size?
Size 4
Size 13
Size 12
Size 5
Size 10
Size 5
Size 11Size 6
9 sizes9 sizes Size 5Size 5
Data handling Data handling
Friday
Objectives for todayObjectives for today
• Extending our knowledge of statistics – range, mode, median and the mean.
•Today we are focusing on finding the medianmedian and the meanmean.
Recap on vocabularyRecap on vocabulary
What does the word mean?
Finding the MEANFinding the MEAN
10 20
15We work this out by adding the
numbers together and dividing thatnumber by the total number
of values in the data set.
Try these!Try these!1 1 2 6 10 6 3
2 4 6 0 8
3g 9g 8g 3g 2g 8g 7g If I change the 7 to 14. Will the
mean be higher or lower?
DecimalsDecimalsSometimes the mean will be a decimal
7cm 8cm
7 Kg 12Kg 15Kg
7ml 11ml 23ml 15ml
What is the ?What is the ?
• 129, 129, 135, 137, 140
A set of numbers are ordered from the smallest to the largest.
The number in the middle is the MEDIAN.
What is the median?What is the median?
3,7,8,10,11,13,15
2,2,2,5,7,8,9,
8,3,4,2,5,9,3,
8,3,4,9,2,5,10
Now try theseNow try these
20, 20, 26, 30
If there is an even number of values in the data setwhen ordered from smallest to largest, the median
is halfway between the middle two.
Now try theseNow try theseNow try theseNow try these
20, 30, 10 ,50, 40, 60
22, 44, 12, 36
50, 100, 10, 30, 70, 90
Remember!Remember!
The numbers must be put into order
before the median can be found!
Recap on vocabularyRecap on vocabulary
What does the word mean?
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