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C
UMULATIVE
F
REQUENCY
T
ABLES
AND
G
RAPHS
A
cumulative frequency distribution
shows the accumulated frequencies of the table.
Ex
.
A cumulative frequency distribution showing litres of fizzy cola syrup sold by 50
employees of Slimline Beverage Company in 1 week.
Litres Sold
Number of
Employees
<80
0
<90
2
<100
8
<110
18
<120
32
<130
41
<140
48
<150
50
How many employees sold between 110 and 120 litres?
32 – 18 = 14 employees.
The graphic presentation of a cumulative frequency distribution is called a
cumulative
frequency graph/curve
or an
ogive
(oh jive).
To find the median, find the halfway point of the cumulative frequencies (25) and draw a
straight line to the curve.
Then draw a straight line down to the xaxis to find the median
value.
A quartile contains a quarter of the data values.
The
lower quartile
(
Q1
) is the value below
which lie onequarter of the data items.
The
upper quartile
(
Q3
) is the value above which
lie onequarter of the data items.
The median divides the data series into two parts, an upper
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This note was uploaded on 07/12/2011 for the course MATH 241 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.
 Fall '08
 Kim
 Calculus

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