Question about Texas Instruments TI-30XA Calculator

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How do you determine absolute value on a TI30XA calculator?

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If you are looking for a key, there is none. However, you can still determine the absolute value easily.

  1. If you have a single number and its positive, the absolute value is the number itself.
  2. If you have a single number and it is negative, just drop the leading minus sign or negate it by pressing the change sign key (+ -).
  3. If you are handling a complicated expression just calculate it. When you obtain the final result (a number) use rule 1 or 2 above.

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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1 Answer

How can I find the mean absolute deviation?


Mean absolute deviation.
Let's break it down into its components.
Mean - Average
Absolute - absolute value - sign doesn't matter - if negative, make positive
Deviation - difference from the mean

Let's do an example. Population 3 7 4 2. Total 16. Mean (Average) 16/4 = 4.

Deviations
3 - 4 = -1 absolute value 1
7 - 4 = 3
4 - 4 = 0
2 - 4 = -2 absolute value 2

Sum of these deviations 1 + 3 + 0 + 2 = 6
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Good luck,

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Anyone know how I can do Absolute Value on this?


The quick way to determine absolute value is to square the value and take the square root of that.
So on the TI, with the value on-screen, just push these 2 keys in sequence (they are right next to each other):
25729793-pa02kysejofs3imjlxoep0yt-4-0.jpg25729793-pa02kysejofs3imjlxoep0yt-4-1.jpg

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What does the Abs button on my scientific calculator


It calculates the absolute value. The absolute value of a number is the number if it's positive, otherwise it's the negative of the number.

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Absolute value


To access the absolute value command, got to Run/Mat screen and press OPTN. Press F6> the F4:NUM, then F1:Abs
In the Y= entry screen, press OPTN, then F5:Num, F1:Abs. enclose the argument of the function inside parentheses.
Here are two screen captures to show how it is done.

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Clear the statistics registers with 2nd [CSR]. Add the data points with Sigma+. Errors can be corrected with 2nd [Sigma-]. Calculate the mean with 2nd [xbar].

See the example on page 11 of this guidebook.

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How do you solve for an inequality with an absolute value using functions on calculator? (example |x-1|<9


Sorry, the calculator cannot solve such ualities (nothing to do with the absolute function).
To find the solution set you need to study the two cases for the absolute value.
Case 1
If x-1> 0, the absolute value is x-1. The inequality takes the form x-1<9. You can solve it as x<10

Case 2
If x-1<0, then the absolute value is 1-x. The inequality becomes 1-x<9. The solution for this inequality is x>-8

Combine the two domains to find the intersection
-8<x<10


2_7_2012_12_43_39_am.png

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1 Answer

I try to graph an absolute value on my Ti 89 and I put the inequality in right but when I go to graph it my calculator says undefined variable.


If you want to graph the absolute value of a function, feed the function to the absolute value ie graph y= abs(f(x)). The calculator will take care of it. See screen captures where I draw the function y1=x^3-5x^2-3 and y2='x^3-5x^2-3'. On the first graph the function is represented and on the second the function and its absolute value.

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The calculator knows how to calculate the absolute value of an expression. The name of the command is abs(

k24674_53.jpg

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You enter a pH value and change the sign to minus, then hit 2nd LOG which is 10^x. The x value is what you're looking for. To put the answer in scientific notation, press 2nd 5 to do so.

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Hiting 2nd 5 will express it as 7.94 -5, giving you the [H+] concentration.

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use a flat screwdriver and pry it open

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