# Geometric Mean I am trying to Calculate the Geometric Mean on a TI-30Xa and am unsure as to the correct sequence of keying. Thank you.

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Before using the gonometric functions (), *,
+, " V, " W, or " X), select
value in a calculation, you must convert it to decimal
with " q.
# (if necessary) DEG
90 ) DEG 1.
> 30 * DEG 0.866025404
J DEG 0.133974596
1 " V DEG 90.
> .5 J DEG 89.5

Also if you need heereis the manual
http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=man

Good Luck

Posted on Jan 21, 2009

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Http://www.wikihow.com/Calculate-the-Geometric-Mean
get the exact system of how to calculate the geometric mean of any equation you want.just click the link and follow the directions step by step.

Posted on Jan 21, 2009

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Hi rsaavedra602

Here is the guide if you need it
http://www.casioeducation.com/resource/pdfs/fx300ms_training_guide.pdf

Standard Deviation
Use the [MODE] key to enter the Standard Deviation (SD) mode when you want to perform statistical calculations using standard deviation. [MODE] [2]
• To clear statistical memory, press [SHIFT] [CLR] [1] [=].
• To enter data, use the following key sequence: <value> [DT]
• Input data is used to calculate the following values:
Sum of the squares (σ x2) [SHIFT] [S-SUM] [1]
Sum of data (σ x) [SHIFT] [S-SUM] [2]
Number of data items (n) [SHIFT] [S-SUM] [3]

HERE > Mean of the data [SHIFT] [S-VAR] [1]

Population standard deviation σ n [SHIFT] [S-VAR] [2]
Sample standard deviation σ n-1 [SHIFT] [S-VAR] [3]

let me know if you need anything else

bestdarngood

Posted on Jan 21, 2009

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Http://www.retrevo.com/support/Casio-fx-300MS-Calculators-manual/id/467dj289/t/2/
get the instructions for using a calci in the link above.

Posted on Jan 21, 2009

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What exactly are the value that you are trying to compute?

Posted on Jan 21, 2009

Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
Goodluck!

Posted on Jan 02, 2017

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For log in base 10 that inverse is 10 to a power of
More generally, let b be the base of the logarithm. If y=log_b (x) then x=b^y
For your case log=log_10, to calculate the inverse you perform 10^(-2)=0.01=1/100
On calculators the log in base 10 and its inverse share the same physical key. One is accessed directly, the other is the shifted key function.

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The inverse of the common log function is the power function with base 10 (10^). It shares the same physical key as the log. You acees the function by pressing [2nd] [log]

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The square root button is two up from the 9 key, just to the left of the divide key. To calculate the square root of 2, for example, press 2 square-root =

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### How do you use the -log function on the TI-30XA calculator? I downloaded the manual and there is no instruction for finding the -log of a number

Do you mean the antilog? For the common antilog, use the shifted function of the LOG key (marked 10^x). For the natural antilog, use the shifted function of the LN key (marked e^x).

For example, to calculate the common antilog of 0.5, press . 5 SHIFT [10^x] = and get about 3.16. To calculate the natural antilog of 0.5, press . 5 SHIFT [e^x] = and get about 1.65.

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Hi,

Ex: calculate -log(15.32)
1. Calculate the log 15.32 [LOG] [=] result 1.185258765
2. Then press the change sign key (-) result -1.185258765
You can also try 15.32 [LOG] (-) [=]. Try to veriufy it on your calculator.

Here is a picture of the change sign
Hope it helps

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If you mean (e to the power x) minus 4, where x = -1, the key sequence would be:

1
+/- (above 3 key)
2nd
LN
-
4
=

Result is -3.63212.....

If you mean e to the power (x-4) where x = -1 again, it's:

10.0067379....
+/- (above 3 key)
-
4
=
2nd
LN

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