HP 49g+ User Manual page 575

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