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© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: 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 ÙS
• 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.
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
s
x ¹
92.6
18


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