Section 6: Functions continue104
For example, suppose that you discover a recording error in the data you have gathered on the maximum and minimum rainfalls in Corvallis, Oregon, and you discover that the maximum and minimum values for January are actually 16.61 and 1.99, rather than 15.51 and 1.99. To account for the change in mean and standard deviation values:
Keystrokes Display    
15.51 ENTER  
  15.5100    
  The incorrect y value.
1.99
  1.99 _    
  The incorrect x value.
g Σ– 
  5.0000    
  Incorrect values have been deleted and the number of entries is now 5 (n = 5).
16.61 ENTER  
  16.6100    
  The correct y value.
1.99
  1.99 _    
  The correct x value.
Σ+ 
  6.0000    
  The correct values have been summed and the number of entries is now 6.
XEQ 
  XEQ _ _    
   
ALPHA MEAN ALPHA 
  0.8650    
  The correct mean of the minimum rainfall per month (mean of x).
X Y 
  14.3317    
  The correct mean of the maximum rainfall per month (mean of y).
XEQ 
  XEQ _ _    
   
ALPHA SDEV ALPHA 
  1.0156    
  The correct standard deviation of minimum rainfall per month (x values).
X Y 
  3.1618    
  The correct standard deviation of maximum rainfall per month (y values).
Operational and General Functions
Audible Tone Functions
The HP-41C is equipped with two functions that allow you to produce audible tones: BEEP and TONE .
When you press BEEP , the HP-41C produces a series of audible tones.
TONE , when followed by a number from 0 through 9, will produce a single audible tone. However, TONE allows you to control the kind of sound produced. A lower number (0, 1, 2, 3, 4) produces a lower pitched sound, and a higher number (5, 6, 7, 8, 9) produces a higher pitched sound.