Texas Instruments TI-30XS User Manual - Page 34

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1. Find Anthony's average grade (weighted average). 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 Σ-----x n = (---1---2---)--(---1 1--3----)--(---0--.--5 1--0----)--(--1 1---1---)---(--0---.-5----) 1 + 0.5 + 1 + 0.5 3. The teacher gave Anthony 4 more points on test 4 due to a grading error. Find Anthony's new average grade. v v4 v"5 12 $13 $10 $11 $"1 $ 8 5 $1 $ 85 $ %t1 (Your screen may not show 3:StatVars if you did not previously perform a calculation.) $""< $ < Anthony has an average (Ï) of 11.33 (to the nearest hundredth). 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. (12)(1) + (13)(0.5) + (10)(1) + (11)(0.5) = 34. Copyright © 2006 Texas Instruments Incorporated 34

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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
represent? What does the value of
Ò
x given by the
calculator represent?
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
n
= 1 + 0.5 + 1 + 0.5.
Ò
x represents the weighted sum of his scores.
(12)(1) + (13)(0.5) + (10)(1) + (11)(0.5) = 34.
v v
4
v"
5
12
$
13
$
10
$
11
$"
1
$ 8
5
$
1
$ 8
5
$
%t
1
(Your screen may not show
3:StatVars
if you did not previously
perform a calculation.)
$""< $
<
Σ
x
n
-----
12
(
)
1
()
13
(
)
0.5
(
)
10
(
)
1
()
11
(
)
0.5
(
)
+
+
+
1
0.5
1
0.5
+
+
+
----------------------------------------------------------------------------------------------------
=