# Revision: averages, range, bar charts and probability

Athlete 1 has a range of 0.11 seconds and Athlete 2 has a range of 1.51 seconds. Who is more consistent?
Athlete 1
Athlete 2
1 / 20
Slide 1: Poll
MathematicsFurther Education (Key Stage 5)

This lesson contains 20 slides, with interactive quizzes.

Lesson duration is: 15 min

## Items in this lesson

Athlete 1 has a range of 0.11 seconds and Athlete 2 has a range of 1.51 seconds. Who is more consistent?
Athlete 1
Athlete 2

#### Slide 1 -Poll

In an analysis of call waiting times, 15 out of 30 were 4 minutes or less. What is the chance that a call will be answered in 4 minutes or less.
A
Impossible
B
50/50 chance
C
unlikely
D
certain

#### Slide 2 -Quiz

Range is the highest - lowest or the maximum- minimum. True or false
A
True
B
False

#### Slide 3 -Quiz

Which calculation will work out 20% of £1195?
A
0.2 x 1195
B
20/1195

#### Slide 4 -Quiz

To calculate the mean...
A
Find the total by adding and divide by the number of items.
B
Subtract the lowest from the highest.

#### Slide 5 -Quiz

Name 5 things that are needed when drawing a bar chart. Make 2 comments on the vertical axis.

#### Slide 6 -Open question

Which checking calculation is correct for this sum: 10-2=8?
A
8+2 = 10
B
10-8=2

#### Slide 7 -Quiz

Which checking calculation is correct for this sum?
1520-1155=365
A
365+1155=1520
B
1520-1155=365

#### Slide 8 -Quiz

The age range in a room was 18. Which is the best explanation of this range?
A
The ages in the room varied a lot.
B
The ages in the room were consistent.

#### Slide 9 -Quiz

The range of missed appointments in 2015 was 203. Which is the best explanation of the range?
A
The range is the highest take away the lowest.
B
The high range shows there was a high variety in the number of missed appointments.

#### Slide 10 -Quiz

What is a good checking calculation for this sum?
145x268=38860
A
268x145=38860
B
38860/268=145

#### Slide 11 -Quiz

To find 1/4 of an amount....
A
divide by 3
B
divide by 4

#### Slide 12 -Quiz

To find 1/3 of an amount....
A
divide by 3
B
divide by 4

#### Slide 13 -Quiz

How can you find 3/4 of an amount?

#### Slide 14 -Open question

What is needed for a table?

#### Slide 15 -Open question

True or false: range is maximum minus minimum.
A
True
B
False

#### Slide 16 -Quiz

The ranges of waiting times to use a computer in 3 libraries last week were as follows: Belfast 8 minutes, Bangor 20 minutes and Lisburn 25 minutes. Which library had the most consistent waiting time?
A
Belfast
B
Bangor
C
Lisburn

#### Slide 17 -Quiz

True or false: a dual bar chart needs a key.
A
True
B
False

#### Slide 18 -Quiz

What is needed for a dual bar chart?

#### Slide 19 -Open question

True or false: The mean is the total divided by the number of items.
A
True
B
False