Texas Instruments ti-30xs Benutzerhandbuch
Copyright © 2006 Texas Instruments Incorporated
34
1. Find Anthony’s average grade (weighted average).
2. What does the value of n given by the calculator
2. What does the value of n given by the calculator
represent? What does the value of Òx given by the
calculator represent?
Reminder: The weighed average is
Reminder: The weighed average is
3. The teacher gave Anthony 4 more points on test 4 due to a
grading error. Find Anthony’s new average grade.
Anthony has an average (Ï) of 11.33 (to the nearest
hundredth).
On the calculator, n represents the total sum of the weights
On the calculator, n represents the total sum of the weights
n = 1 + 0.5 + 1 + 0.5.
Òx represents the weighted sum of his scores.
Òx represents the weighted sum of his scores.
(12)(1) + (13)(0.5) + (10)(1) + (11)(0.5) = 34.
v v4
v"5
v"5
12 $13 $10 $11 $"1 $ 8
5 $1 $ 85 $
%t1
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3:StatVars if you did not previously
perform a calculation.)
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Σx
n
------
12
( ) 1
( )
13
( ) 0.5
(
)
10
( ) 1
( )
11
( ) 0.5
(
)
+
+
+
1 0.5 1 0.5
+
+
+
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