Texas Instruments TI-30X - IIS Scientific Calculator Teachers Manual page 19

What's My Score? — 1-Variable Statistics
Extension
Note: Make sure you exit the
to another problem.
© 1999 T I I
EXAS NSTRUMENTS NCORPORATED
mode before going on
STAT
TI-30X ÙS: A Guide for Teachers
³ 1. Press % t " " to
select . Press
CLRDATA
<.
2. Press v and enter the
friend's first score.
X1 = 89
3. Continue entering the
friend's scores and
frequencies, following
steps 3 and 4 on the
previous page.
4. When finished, press
u " to select
average. Write it down.
n v Sx sx ¹
93.0
³ 1. Press % t and " "
to . Press <.
CLRDATA
2. Recalculate your friend's
average, making sure to
include the new score.
3. Use guess and check to
figure out what score you
need to get.
4. To exit mode, press
STAT
% w <.
(Cont.)
v
, the
15