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
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Lesson duration is: 15 minItems 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
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
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
