Texas Instruments TI-36X Pro User Manual page 42

Stat
³ 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.
Score
Coefficient
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 Gx given by the
calculator represent?
Reminder: The weighed average is
Σx (
12
----- - --------------------------------------------------------------------------------------------------------
=
n
3. The teacher gave Anthony 4 more points on test 4 due to a
grading error. Find Anthony's new average grade.
v v $ $ $
% u
3 (Selects 2-Var Stats)
$ $ $
< % s
% u 1
# # # # # #
< 45 ) <
1
12
1
) 1 ( ) ( ) 0.5
+ 13
1
2 3
13 10
0.5 1
( ) (
+ 10
+ 0.5 + + 1
42
4
11
0.5
) 1 ( ) ( ) 0.5
+ 11
0.5
( )