Orion TI-
30XS MultiView™ User’s Guide - User guide
Version 1.0
Orbit Research
Confidential and Proprietary Information
33
Stat
2nd, [stat]
,
2
,
(Your screen may not show
3:StatVars
if you did
not previously perform a calculation.)
Result = Stats 2:
down arrow, down arrow
Result = Calc
enter, up arrow, up arrow, up arrow, up arrow,
up arrow, up arrow
Result = 2-Var: L1,
L1 G up arrow
enter
,
45
,
), enter
Result = 15
Problem
For his last four tests, Anthony obtained the following scores. Tests 2 and 4 were
given a weight of 0.5, and tests 1 and 3 were given a weight of 1.
Test No.
1
2
3
4
Score
12 13 10 15
Coefficient 1
0.5 1
0.5
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
Σx
given by the calculator represent?
Reminder: The weighed average is
Σx/n = [(12)(1) + (13)(0.5) + (10)(1) + (11)(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.
data, data
,
4
,
data, right arrow
,
5
Result = Clear 4:
Formula 5:
12
,
down arrow
,
13
,
down arrow
,
10
,
down arrow
,
11
,
down arrow, right arrow
,
1
,
down arrow, ·
,
5
,
down arrow
,
1
,
down arrow, ·
,
5
,
down arrow
Result = L2(5)=
2nd, [stat]
,
1
(Your screen may not show
3:StatVars
if you did not
previously perform a calculation.)
Result = Stats 1:
down arrow, right arrow, right arrow, enter, down arrow
Result = Calc
enter
Result = 1-Var:
L1, L2 1:
Anthony has an average (
x̄
) 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.
Σ
x represents the weighted sum of his scores. (12)(1) + (13)(0.5) + (10)(1) +
(11)(0.5) = 34.
