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Standard Deviation question

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If we're given a table such as the following, how do we calculate the standard deviation?

 

Grade     Number of students     Cumulative frequency
   1                        9                                        9
   2                       25                                      34
   3                       35                                      69
   4                       40                                     109
   5                       11                                     120

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Well, I can tell you on a calculator.

 

I use a TI-84 FYI.

 

So go to "Stat", hit "Edit". On List 1, put grade

List 2 put Frequency.

 

Hit "Stat" again, and use the arrow keys to move to "CALC". Hit Single variable dist. (Its the first option I think).

Then, you get it all.

Hope this helps.

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Well, I can tell you on a calculator.

 

I use a TI-84 FYI.

 

So go to "Stat", hit "Edit". On List 1, put grade

List 2 put Frequency.

 

Hit "Stat" again, and use the arrow keys to move to "CALC". Hit Single variable dist. (Its the first option I think).

Then, you get it all.

Hope this helps.

 

Thank you! Do we enter the frequency or the cumulative frequency?

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^Anybody knows how to do this with the ti-nspire cx?

New Document > Add List > For A write x, and all the grades, for B write y and the respective number of students (frequency) > Click Menu > Statistics > Stat Calc > One Variable Statistics > Num of Lists: 1 > X1 List: 'x, Freq List: 'y, press OK 

 

Hence you will have your mean, s. dev, etc

Edited by dorianb

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