Standard deviation using the TI-30x IIs

With this list, we can use the TI-30x IIs to get the average and both standard deviations, sx, the standard deviation for a sample and sigmax, the standard deviation for a population.

The buttons to press will be written in red.


Here is a data set we will input.


60, 60, 60, 61, 62, 62, 63, 63,64, 65, 65, 66, 66, 66, 66, 66, 66, 66, 66,
68, 68, 69, 69, 69, 70, 70, 71, 71, 71, 72, 72, 74, 76, 77, 78

[2nd][DATA][ENTER] This puts the calculator in one variable mode.
[2nd][DATA][LEFT][ENTER] This clears the data.
[DATA]
X1= 60 [DOWN]
FRQ= 3 [DOWN]X2= 61 [DOWN]
FRQ= 1 [DOWN]X3= 62 [DOWN]
FRQ= 2 [DOWN]X4= 63 [DOWN]
FRQ= 2 [DOWN]X5= 64 [DOWN]
FRQ= 1 [DOWN]X6= 65 [DOWN]
FRQ= 2 [DOWN]X7= 66 [DOWN]
FRQ= 8 [DOWN]X8= 68 [DOWN]
FRQ= 2 [DOWN]X9= 69 [DOWN]
FRQ= 3 [DOWN]X10= 70 [DOWN]
FRQ= 2 [DOWN]X11= 71 [DOWN]
FRQ= 3 [DOWN]X12= 72 [DOWN]
FRQ= 2 [DOWN]X13= 74 [DOWN]
FRQ= 1 [DOWN]X14= 76 [DOWN]
FRQ= 1 [DOWN]X15= 77 [DOWN]
FRQ= 1 [DOWN]X16= 78 [DOWN]
FRQ= 1 [DOWN]
[STATVAR] This shows the statistics variables.
n x-bar sx sigmax
35[RIGHT]n x-bar sx sigmax
67.37142857[RIGHT]n x-bar sx sigmax
4.747046848[RIGHT]n x-bar sx sigmax
4.67870455[RIGHT]