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I don;t undersdtand what x bar is - Texas Instruments TI-30XA Calculator

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"x bar" returns the mean of a series of numbers entered in "statistical mode".

e.g.enter 3, then press the "sigma plus" key (just above the "STO" key. Display will show "n = 1" and "STAT" will display to remind you that you are in statistical mode.

Enter 3 the "sigma plus" and you will see "n = 2" to tell you that you have entered two numbers. Keep doing this for a few more, then press "2nd x bar" and you will see the mean of all the numbers you entered, which is 3 if you entered all 3's.

To exit "STAT" mode, you have to press "2nd" then "CSR" (just above the 7 key), since the regular "clear" key only clears the pending entry.

Lots of simple statistical stuff you can do on the TI-30XA, read the guide book, available online at TI if you don't have one

Posted on Dec 31, 2008

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How to find antilog of the numbers with a bar sign from scientific calculator

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Conversion from psi to bar

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My ti-84 calculator wont react to anything and it says garbage collecting. i think the bar on the side should move and its not moving and its been like this for several weeks. i did download a whole pile...

I remember this happening once to my TI-83. I know it's a different calculator. But it happened frequently. Without completely reconfiguring the calculator, you can remove the batteries whenever you see the message and when you start it up again, it should be okay. It may continue to display this message once in a while. I used to just remove the batteries. I don't know if it will work on your TI-84 the way it worked on my TI-83, but I hope this helped!
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How do you do fraction, and

To enter the fraction two-thirds (2/3), first enter the number two. Then press the key that is the letter n with a bar underneath it. This will designate the 2 as the numerator of the fraction. Then, enter the number 3 followed by the key that is the letter d with a bar over it. That designates the 3 as the denominator of the fraction.
Any fraction can be inputted in the same manner. First the numerator followed by the n with a bar under it, then the denominator followed by the d with the bar over it. Once your fraction is inputted, continue with your computations as normal.

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I was just wondering how exactly to get the fraction bar on the fx-115LS model so I can do out a problem for my math homework.

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Mean (x-bar), variance (s^2) and standard deviation (s)

Enter 1 then press the (SIGMA)+ button (SIGMA) looks like a sideways capital M ....its a Greek letter.

Then enter 2 and press the (SIGMA)+ button
Then enter the next value and press the (SIGMA)+ button

After you press the (SIGMA)+ button the calculator displays the number of numbers you have entered

Once all numbers of your sample have been entered press 2nd and the button corresponding to x-bar

sample st. dev is the (sigma)n-1 button (need to use 2nd button)
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population st. dev is the (sigma)n-1 button (need to use 2nd button)
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Jan 18, 2008 | Texas Instruments TI-30XA Calculator

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