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
 15.51
The incorrect y value.
1.99
 1.99 _
The incorrect x value.
g Σ–
 5
Incorrect values have been deleted and the number of entries is now 5 (n = 5).
16.61 ENTER
 16.61
The correct y value.
1.99
 1.99 _
The correct x value.
Σ+
 6
The correct values have been summed and the number of entries is now 6.
XEQ
 XEQ _ _

ALPHA MEAN ALPHA
 0.865
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.