HP 48gII Graphing Calculator Uživatelský manuál stáhnout pdf (Strana 274)

Given the list of class marks S = {s

}, and the list of frequency

counts W = {w

}, the weighted average of the data in S with

weights W represents the mean value of the grouped data, that we call s, in

this context:

represents the total frequency count.

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

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HP 48gII Graphing Calculator Uživatelský manuál Strana 274