CFALA
Review:
Tips
for
using
the
TI
calculator
2/9/2015
By
David
Cary
14
•
The
next
two
slides
show
how
to
use
the
built
‐
in
statistic
functions
to
do
Geometric
and
Harmonic
Average
calculations.
•
I’m
not
sure
they
are
any
easier,
but
thought
I
would
include
them
so
you
can
compare.
CFA Society Los Angeles
27
Using
the
Statistics
Function
to
Calculate
Geometric
Mean
Keys
Display
Comments
[2
nd
]
[DATA]
[2
nd
] [CLR
WORK]
X01 0.0000
Clears
Memories
3
[LN]
[ENTER]
X01=1.0986 Converts
to Log,
Enters
first
value
3
[LN]
[ENTER]
X02=1.0986 Converts
to Log,
Enters
second
value
4
[LN]
[ENTER]
X03=1.3863 Converts
to Log,
Enters
third
value
6
[LN]
[ENTER]
X04=1.7918 Converts
to Log,
Enters
fourth
value
22[LN]
[ENTER] X05=3.0910 Converts
to Log,
Enters
fifth value
[2
nd
]
[STAT]
LIN
Just shows
in
linear
format
N
=
5.0000
x
=
1.6933
The average
of
the
logs
[2
nd
] [e
x
]
5.4372
Converts
the
average
of
the
logs
to
the
answer!
•
Data:
3,
3,
4,
6,
22
Note:
converting
the
numbers
to
logs,
calculating
the
average,
then
using
e
x
is
the
same
as
multiplying
the
numbers
and
taking
the
root.
CFA Society Los Angeles
28
Probably
easier
to
just
multiply
the
numbers
and
take
the
root!
