Texas Instruments TI-30X Teachers Guide - Page 18

What's My Score? - 1-Variable Statistics

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What's My Score? - 1-Variable Statistics Overview Students use the given test scores to find averages. Introduction Discuss finding averages with your students. Activity Present the following problem to students: You and your friend are having a contest. The one gets the highest average on their math tests for one quarter wins. Your scores are 98, 89, 78, 98, and 100. Your friend’s scores are 89, 89, 97, 90, and 100. Who is the winner? Procedure 1. Have students find the average of their scores using the TI-30X ÙS. Remember to enter 2 as the frequency for 98 and 1 for all others. Math Concepts • averages Materials • TI-30X ÙS • pencil • student activity ³ 1. Press % t < to select 1-VAR mode. 2. Press v and enter your first score. X1 = 98 3. Press $ and enter 2 as the frequency for 98. FRQ = 2 4. Press $. Continue entering your scores and frequencies, pressing $ after each score and frequency. 5. When finished, press u " to select v, the average. Write it down. n v Sx sx ¹ 92.6 © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide for Teachers 14

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© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide for Teachers
14
What’s My Score? — 1-Variable Statistics
Overview
Students use the given test scores to find averages.
Math Concepts
• averages
Materials
• TI-30X
Ù
S
• pencil
• student activity
Introduction
Discuss finding averages with your students.
Activity
Present the following problem to students:
You and your friend are having a contest. The one
gets the highest average on their math tests for one
quarter wins. Your scores are 98, 89, 78, 98, and
100. Your friend±s scores are 89, 89, 97, 90, and
100. Who is the winner?
Procedure
1.
Have students find the average of their scores
using the TI-30X
Ù
S. Remember to enter 2 as the
frequency for 98 and 1 for all others.
‡
1.
Press
%
t
<
to
select
1-VAR
mode.
2.
Press
v
and enter your
first score.
X1 = 98
3.
Press
$
and enter
2
as
the frequency for 98.
FRQ = 2
4.
Press
$
. Continue
entering your scores and
frequencies, pressing
$
after each score and
frequency.
5.
When finished, press
u
"
to select
v
, the
average. Write it down.
n
v
Sx
s
x
¹
92.6