HP 35s Scientific Calculator - Manual (Page 265)

Statistics Programs 16-19
This program allows you to input data, correct entries, and calculate the standard
deviation and weighted mean of the grouped data.
Program Listing:
Program Lines:
(In ALG mode)
Description
   Start grouped standard deviation program.
  Clears statistics registers (-27 through -32).
 
  
Clears the count N.
Checksum and length: E5BC 13
   Input statistical data points.
   Stores data point in X.
   Stores data–point frequency in F.
  Enters increment for N.
  
  
Recalls data–point frequency f
i
.
Checksum and length: 3387 19
   Accumulate summations.
 
  
Stores index for register -27.
  
 
Updates in register -27.
  
  
 
  
Stores index for register -28.
  
 
Updates in register -28.
  
  
Stores index for register -30.
 
  
  
∑
i
f
i i
f x
∑
i i
f x
i
2
i
f x