Data handling Thursday. Objectives for today Extending our knowledge of statistics – range, mode,...

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?