HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 273)

3. Use function ΣLIST, once more, to calculate the denominator of s

4. Use the expression ANS(2)/ANS(1) to calculate the weighted

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

Class Frequency

Class mark count

boundaries s

The class mark data can be stored in variable S, while the frequency count

can be stored in variable W, as follows:

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HP 48gII Graphing Calculator Manual do Utilizador Página 273