What's My Score - 1-Variable Statistics; What's My Score? - 1-Variable Statistics - Texas Instruments TI-30X IIS User Manual

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
who 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 ÖS. Remember to enter 2 as the
frequency for 98 and 1 for all others.
© 1999 T I I
EXAS NSTRUMENTS NCORPORATED
Math Concepts
• averages
³ 1. Press % t < to
select
2. Press v and enter your
first score.
X1 = 98
3. Press $ and enter
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
TI-30X ÙS: A Guide for Teachers
Materials
• TI-30X ÙS
• pencil
student activity
mode.
1-VAR
as
2
92.6
14