# AVERAGES

24 = H in the D
1 / 33
Slide 1: Open vraag
MathematicsUpper Secondary (Key Stage 4)GCSE

In deze les zitten 33 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

24 = H in the D

28 = D in F

7 = W of the W

5 = V of the A

90 = D in a RA

#### Slide 5 -Open vraag

What we will learn today:
• What an average is
• Everyday uses for averages
• How to work out a mean of a set of data
• How to work out a median of a set of data
• How to work out the mode of a set of data
• How to calculate a range and what it shows

#### Slide 6 -Tekstslide

What is an average?

#### Slide 7 -Open vraag

An average is a representative or ‘typical’ value in a set of data.

#### Slide 8 -Tekstslide

From day 1 you are being measured against an average...
Length
How old are you when you sit up/crawl/walk/talk
Weight

#### Slide 9 -Tekstslide

The average person will take .............. steps a day

#### Slide 10 -Open vraag

The average person falls asleep in .......... mins

#### Slide 11 -Open vraag

The average person laughs ........... times a day

#### Slide 12 -Open vraag

When do we use averages day to day?

3 Averages:
Mean
Median
Mode

#### Slide 18 -Tekstslide

Mean
Add up all the numbers and divide by how many numbers there are

#### Slide 19 -Tekstslide

Best used when:
There are no extreme values

#### Slide 20 -Tekstslide

The shoe sizes of 10 children in a school are:
5 4 6 5 7 5 2 8 6 12
What is the mean size?

#### Slide 21 -Open vraag

The weekly costs of 5 nurseries are:
£150, £180, £130, £190, £160
What is the mean cost?

#### Slide 22 -Open vraag

Median
Pick the middle number
If there are 2 numbers in the middle, add them and divide by 2

#### Slide 23 -Tekstslide

Best for:
When there are extreme values in your data

#### Slide 24 -Tekstslide

Attendance in a class in your school was the following over one week: 23, 28, 21, 19, 27
What was the median attendance?

#### Slide 25 -Open vraag

Here are the total minutes 4 toddlers slept in daycare during the day:
45, 30, 80, 60. What is the median?

#### Slide 26 -Open vraag

Mode
The mode is the number/item which occurs the most

#### Slide 27 -Tekstslide

A class was asked how many messages they think they send on their phone each day:
50, 65, 30, 80, 50, 20, 65, 50, 40 What is the mode?

#### Slide 28 -Open vraag

The range is a measurement of how spread out data is.

Range  = Highest number - lowest number

#### Slide 29 -Tekstslide

Maths exam results for a class were:
66%, 85%, 75%, 90%, 40%, 70%
What was the range?

#### Slide 30 -Open vraag

Remember this:
Hey diddle diddle,
The median's the middle,
You add then divide for the mean.
The mode is the one you see the most,
and the range is the difference between.

#### Slide 31 -Tekstslide

I feel confident using averages and range
😒🙁😐🙂😃