HP F2226A - 48GII Graphic Calculator User Manual page 274

Graphing calculator
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Given the list of class marks S = {s
counts W = {w
, w
, ..., w
1
2
weights W represents the mean value of the grouped data, that we call s, in
this context:
n
N
=
w
where
represents the total frequency count.
k
k
=
1
The mean value for the data in lists S and W, therefore, can be calculated
using the procedure outlined above for the weighted average, i.e.,
We'll store this value into a variable called XBAR:
The variance of this grouped data is defined as
n
k
=
V
=
, s
, ..., s
}, and the list of frequency
1
2
n
}, the weighted average of the data in S with
n
n
n
w
s
w
k
k
s
=
k
=
1
=
k
=
1
n
N
w
k
k
=
1
n
2
w
(
s
s
)
w
k
k
1
k
=
1
=
n
w
k
k
=
1
s
k
k
,
2
(
s
s
)
k
k
N
Page 8-19

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