Question about Texas Instruments TI-30XA Calculator
"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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