Texas Instruments TI-73 EXPLORER - Manual (Page 137)

Chapter 7: Statistical Analyses
131
7307ENG.DOC CH 7, Statistical Analyses, English Julie Hewlett Revised: 07/29/98 12:07 PM Printed: 05/19/99
9:00 AM Page 131 of 22
2. Return to the Home screen,
and calculate the average of
the test scores.
- l :
- v " "
3
- v
TEST
b ¡ - v
FREQ
b E b
stdDev( stdDev( - v " " 6 6
stdDev(
returns the standard deviation of list. If a second list,
freq, is specified, it is interpreted as the frequency of the
elements in the first list. list and freq must have the same
number of elements.
stdDev(
list,freq[,type]
)
type=
0
(population standard deviation) or
1
(sample
population deviation). If type is not specified, the calculator
returns sample population deviation.
Find the population standard
deviation of ¨ TEST
(from the
previous example). Use ¨ FREQ
as
your freq.
- v " "
6
- v
TEST
b
¡ - v
FREQ
b ¡
0
E b
³
Solution David's final course
average is 80.25.