# HP 49g+ User Manual Page 575

Graphing calculator.

Advertisement

of the next row.
Thus, for the second class, the cumulative frequency is
18+15 = 33, while for class number 3, the cumulative frequency is 33 + 16 =
49, and so on.
The cumulative frequency represents the frequency of those
numbers that are smaller than or equal to the upper boundary of any given
class.
Class
Class
Bound.
No.
i
XB
XB
i
< XB
outlier
below
1
range
1
10
2
20
3
30
4
40
5
50
6
60
7
70
k = 8
80
>XB
outliers
above
k
range
Given the (column) vector of frequencies generated by the calculator, you can
obtain a cumulative frequency vector by using the following program in RPN
mode:
« DUP SIZE 1 GET
'cfreq(1,1)' STO 2 k FOR j 'cfreq(j-1,1) +freq(j,1)' EVAL 'cfreq (j,1)' STO
NEXT cfreq " " "
Save it under the name CFREQ. Use this program to generate the list of
cumulative frequencies (press @CFREQ with the column vector of frequencies in
the stack). The result, for this example, is a column vector representing the last
column of the table above.
Class
Frequency Cumulative
mark.
Xm
f
i+1
i
i
25
20
15
18
30
25
14
40
35
17
50
45
17
60
55
22
70
65
22
80
75
24
90
85
19
22
freq k « {k 1} 0 CON
frequency
18
32
49
66
88
110
134
153
cfreq « 'freq(1,1)' EVAL
Page 18-8

Advertisement

Table of Contents

Symbols: 0