Texas Instruments TI-34 II Teachers Guide - Page 20
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. Math Concepts • averages Materials • TI-34 Û • pencil • student activity (page 16) Introduction Discuss finding averages with your students. Activity Present the following problem to students: You and your friend are having a contest. Whoever 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-34 Ö. Remember to enter 2 as the frequency for 98 and 1 for all others. ³ Be sure that the TI-34 Ö is set to floating decimal before you begin this activity. Press % , 8. 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-34 Û: A Guide for Teachers 14