Slides in this set

Slide 1

Preview of page 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

Preview of page 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

Preview of page 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

Preview of page 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

Preview of page 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

Comments

No comments have yet been made

Similar Mathematics resources:

See all Mathematics resources »