# Cumulative Frequency

- Created by: leah
- Created on: 18-05-13 18:33

## Slides in this set

### Slide 1

Objective: To draw CF curves and

Cumulative Frequency find median and inter-quartile range.

The table shows the times taken to complete 20 telephone calls.

Time Frequency Time Cumulative

Frequency

0t·3 5 t·3

3t·6 8 +

t·6 13

6t·9 4 t·9 +

17

9 t · 15 3 t · 15 +

20

Draw a cumulative

frequency table.

Lesley Hall @ Soar Valley College…read more

### Slide 2

Objective: To draw CF curves and

Cumulative Frequency find median and inter-quartile range.

Drawing a cumulative frequency curve. Time CF

t·3 5

21

t·6 13

Cumulative frequency

18 t·9 17

15 t · 15 20

12

9

6

3

0

0 2 4 6 8 10 12 14 16

Time (mins)

Lesley Hall @ Soar Valley College…read more

### Slide 3

Objective: To draw CF curves and

Cumulative Frequency find median and inter-quartile range.

Drawing a cumulative frequency curve. Time CF

t·3 5

21

t·6 13

Cumulative frequency

18 t·9 17

15 t · 15 20

12

9

6

3

0

0 2 4 6 8 10 12 14 16

Time (mins)

Lesley Hall @ Soar Valley College…read more

### Slide 4

Objective: To draw CF curves and

Cumulative Frequency find median and inter-quartile range.

Finding the median, lower and upper quartile.

The

The

The lower

upper quartile

median is at

21 is at the mark.

25%

75%

the 50%

mark.

Cumulative frequency

18

15 Upper

75% Q=

of 20 =7

15

12

9 10Median

is 50% =

of520

6

5Lower

is 25%Qof

= 20

3

3

0

0 2 4 6 8 10 12 14 16

Time (mins)

Lesley Hall @ Soar Valley College…read more

### Slide 5

Objective: To draw CF curves and

Cumulative Frequency find median and inter-quartile range.

Finding the inter-quartile range

21

Cumulative frequency

18

15 Upper Q = 7 73=4

12

9 Median = 5 The inter-quartile range is

the difference between

6 the upper and lower

Lower Q = 3 quartiles.

3

0

0 2 4 6 8 10 12 14 16

Time (mins)

Lesley Hall @ Soar Valley College…read more

## Related discussions on The Student Room

- Is there any other way to plot frequency data? »
- median from histograms? »
- median from histograms? »
- SPSS Help »
- Expected Value Problem »
- Official Edexcel Statistics 1 thread - 10th June 2014 »
- AQA A2 Mathematics MS2B Statistics 2 ? Friday 12th June ... »
- Maths, S1, Linear Interpolation question »
- s1 help »
- Maths S2 - Revision... HELP??? »

## Comments

No comments have yet been made