Outline:
Line 1. Clear
Line 2 - 7. Instructions
Line 12 - 15. Lbl D - input data
Line 17 - 20. Lbl L - input list
Line 22 - 25. calculator built-in formula [dim( and sum( ]. L1² squares X.
Line 26 - 28. formula for mean, variance & standard deviation
Line 30 - 42. Lbl X - display
Line 36. fix 4
Line 44. clear fix 4 (line 36)

prgmSTDEVFRM
Line	 Command or Statement	 Comments
   1.	 ClrHome	 Clear Screen
   2.	 Output(1,1,"SELECT LIST OR	 Instructions
   3.	 Output(2,1,"DATA TO BEGIN -	        |
   4.	 Output(3,1,"USE COMMAS BTWN	        |
   5.	 Output(4,1,"NUMBERS IN LIST	        |
   6.	 Output(5,1,"ENTER n, Σx, Σx²	        |
   7.	 Output(6,1,"FOR DATA	 End Instructions
   8.	 Pause	 
   9.	 ClrHome	 
 10.	 Float	 
 11.	 Menu("STD DEV","LIST",L,"DATA",D	 
 12.	 Lbl D	 Input Data
 13.	 Input "n =",N	 n = sample size
 14.	 Input "Σx =",B	 Σx = sumX
 15.	 Input "Σx² =",Y	 Σx² = sumXsquared
 16.	 Goto X	 
 17.	 Lbl L	 Input List 1
 18.	 Disp "DATA LIST	 
 19.	 Input "L1=",Str1	 
 20.	 expr("{"+Str1->L1	 
 21.	 ClrHome	 clear screen - calculations
 22.	 dim(L1->N	 n       dim(  calculator formula
 23.	 sum(L1->B	 Σx;    sum(  calculator formula
 24.	 sum(L1²->Y	 Σx²    sum(  calculator formula
 25.	 Lbl X	 formula calculations & display
 26.	 B/N ->C	 calculates mean    x
 27.	 ((Y - ((B) ²/N))/(N - 1)) ->V	 calculates variance
 28.	 √(V) -> S	 standard deviation
 29.	 ClrHome	 Clear screen - display
 30.	 Disp "n =	 
 31.	 Output(1,4,N	 display n
 32.	 Disp "Σx =	 
 33.	 Output(2,5,B	 display Σx
 34.	 Disp "Σx ² =	 
 35.	 Output(3,6,Y	 display Σx ²
 36.	 Fix 4	 set decimal to 4 places
 37.	 Disp "x =	 
 38.	 Output(4,4,C	 display mean (x)
 39.	 Disp "S² =	 
 40.	 Output(5,5,V	 display variance (S²)
 41.	 Disp "S =	 
 42.	 Output(6,4,S	 display standard deviation (S)
 43.	 Pause	 
 44.	 Float	 clear fix 4 (line 36)
 45.	 ClrHome	 
 
Example:
List: 25, 24, 23, 22, 20, 18, 17, 16, 14, 10, 8
Data: n = 11,  Σx = 197,  Σx² = 3843 
Answers: n = 11,  Σx = 197,  Σx² = 3843,  x = 17.9091,  S² = 31.4909,  S = 5.6117
 
Example:
List: 13, 12, 11, 11, 10, 9, 9, 9, 6, 4
Data: n = 10,  Σx = 94,  Σx² = 950 
Answers: n = 10,  Σx = 94,  Σx² = 950,  x = 9.4000,  S² = 7.3778,  S = 2.7162
 
Reference:
Commands:
ClrHome   clears home screen
dim(   returns the dimension (number of elements) of list
Disp   displays text or value specified
expr(   converts string to an expression
Fix   sets fixed-decimal mode for number of decimal places
Float   sets floating decimal mode. Displays decimal with no trailing zeros
Goto   goes to label specified. Goto requires a line label be implemented as a destination
Input   prompts for value to store to variable. Requires user input through keypad.
Lbl   creates a label of one or two characters
Menu   generates a menu of up to seven items
Output(row, column)   displays text or value beginning at specified row and column
Str# (# is number)   String: A sequence of characters is called a string
sum(   returns the sum of elements in list