HP 12c Owners Manual
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Page 71
Section 5: Additional Operating Features 71 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 71 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm The Display Status Indicators Six indicators that appear along the bottom of the display signify the status of the calculator for certain operations. These status indicators are described elsewhere in this handbook where the relevant operation is discussed. Number Display Formats When the calculator is first turned on...
Page 72
72 Section 5: Additional Operating Features File name: hp 12c_users guide_English_HDPMBF12E44 Page: 72 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Keystrokes Display f4 14.8746 f1 14.9 f0 15. f9 14.87456320 Although nine decimal places were specified after f , only eight are displayed since the display can show a total of only 10 digits. The standard display format, plus the specified number of decimal places, remain in effect until you change them; they...
Page 73
Section 5: Additional Operating Features 73 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 73 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Keystrokes Display f. 1.487456 01 The exponent in this example indicates that the decimal point should be moved one decimal place to the right, giving the number 14.87456, which is the first seven digits of the number previously in the display. To set the display back to standard display format, press f followed by the...
Page 74
74 Section 5: Additional Operating Features File name: hp 12c_users guide_English_HDPMBF12E44 Page: 74 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Errors. If you attempt an improper operation — such as division by zero — the calculator will display the word Error followed by a digit (0 through 9 ). To clear the Error display, press any key. This does not execute that key’s function, but does restore the calculator to its condition before the improper operation was...
Page 75
![Page 75
Section 5: Additional Operating Features 75
File name: hp 12c_users guide_English_HDPMBF12E44 Page: 75 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Arithmetic Calculations With Constants
Example:
At Permex Pipes a certain pipe fitting is packaged in quantities of 15,
75, and 250. If the cost per fitting is $4.38, calculate the cost of each package.
Keystrokes Display
15\
15.00 Keys first quantity into calculator.
4.38
4.38 Keys unit cost into display.
§
65.70...](http://img.usermanuals.tech/thumb/36/94369/w300_12c-owners-manual-1504786742_d-74.png "Page 75
Section 5: Additional Operating Features 75
File name: hp 12c_users guide_English_HDPMBF12E44 Page: 75 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Arithmetic Calculations With Constants
Example:
At Permex Pipes a certain pipe fitting is packaged in quantities of 15,
75, and 250. If the cost per fitting is $4.38, calculate the cost of each package.
Keystrokes Display
15\
15.00 Keys first quantity into calculator.
4.38
4.38 Keys unit cost into display.
§
65.70...")
Section 5: Additional Operating Features 75 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 75 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Arithmetic Calculations With Constants Example: At Permex Pipes a certain pipe fitting is packaged in quantities of 15, 75, and 250. If the cost per fitting is $4.38, calculate the cost of each package. Keystrokes Display 15\ 15.00 Keys first quantity into calculator. 4.38 4.38 Keys unit cost into display. § 65.70...
Page 76
76 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 76 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Section 6 Statistics Functions Accumulating Statistics The hp 12c can perform one- or two-variable statistical calculations. The data is entered into the calculator using the _ key, which automatically calculates and stores statistics of the data into storage registers R 1, through R6. (These registers are therefore referred to as the “statistics registers.”)...
Page 77
Section 6: Statistics Functions 77 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 77 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm The table below shows where the accumulated statistics are stored. Register Statistic R1 (and display) n: number of data pairs accumulated. R2 Σx: summation of x-values. R3 Σx2: summation of squares of x-values. R4 Σy: summation of y-values. R5 Σy2 summation of squares of y-values. R6 Σxy: summation of products of x-values and...
Page 78
![Page 78
78 Section 6: Statistics Functions
File name: hp 12c_users guide_English_HDPMBF12E44 Page: 78 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Salesperson Hours/Week Hours/Week
1 32 $17,000
2 40 $25,000
3 45 $26,000
4 40 $20,000
5 38 $21,000
6 50 $28,000
7 35 $15,000
To find the average workweek and sales of this sample:
Keystrokes Display
fCLEAR²
0.00 Clears statistics registers.
32\
17000_
32.00
1.00
First entry.
40\
25000_
40.00
2.00
Second entry.
45\...](http://img.usermanuals.tech/thumb/36/94369/w300_12c-owners-manual-1504786742_d-77.png "Page 78
78 Section 6: Statistics Functions
File name: hp 12c_users guide_English_HDPMBF12E44 Page: 78 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Salesperson Hours/Week Hours/Week
1 32 $17,000
2 40 $25,000
3 45 $26,000
4 40 $20,000
5 38 $21,000
6 50 $28,000
7 35 $15,000
To find the average workweek and sales of this sample:
Keystrokes Display
fCLEAR²
0.00 Clears statistics registers.
32\
17000_
32.00
1.00
First entry.
40\
25000_
40.00
2.00
Second entry.
45\...")
78 Section 6: Statistics Functions File name: hp 12c_users guide_English_HDPMBF12E44 Page: 78 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Salesperson Hours/Week Hours/Week 1 32 $17,000 2 40 $25,000 3 45 $26,000 4 40 $20,000 5 38 $21,000 6 50 $28,000 7 35 $15,000 To find the average workweek and sales of this sample: Keystrokes Display fCLEAR² 0.00 Clears statistics registers. 32\ 17000_ 32.00 1.00 First entry. 40\ 25000_ 40.00 2.00 Second entry. 45\...
Page 79
Section 6: Statistics Functions 79 File name: hp 12c_users guide_English_HDPMBF12E44 Page: 79 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Standard Deviation Pressing gv calculates the standard deviation of the x-values (sx) and of the y-values (s y). (The standard deviation of a set of data is a measure of the dispersion around the mean.) The standard deviation of the x-values appears in the display after v is pressed; to display the standard deviation of the...
Page 80
80 Section 6: Statistics Functions File name: hp 12c_users guide_English_HDPMBF12E44 Page: 80 of 209 Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm Linear Estimation With two-variable statistical data accumulated in the statistics registers, you can estimate a new y-value ( yˆ) given a new x-value, and estimate a new x-value (xˆ) given a new y-value. To calculate yˆ: 1. Key in a new x-value. 2. Press gR. To calculate xˆ: 1. Key in a new y-value. 2. Press gQ. Example:...