Statistics Of Grouped Data - HP 50g User Manual

3. Use function LIST, once more, to calculate the denominator of s
4. Use the expression ANS(2)/ANS(1) to calculate the weighted average:
Thus, the weighted average of list S with weights in list W is s
Note: ANS(1) refers to the most recent result (55), while ANS(2) refers to
the previous to last result (121).

Statistics of grouped data

Grouped data is typically given by a table showing the frequency (w) of data in
data classes or bins. Each class or bin is represented by a class mark (s),
typically the midpoint of the class. An example of grouped data is shown next:
Class
Class mark
boundaries
0 - 2
2 - 4
4 - 6
6 - 8
8 -10
Frequency
count
s w
k k
1 5
3 12
5 18
7 1
9 3
:
w
= 2.2.
w
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