Random Numbers; Statistical Calculations - LEXIBOOK SC300i Manual De Instrucciones

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Temporary memories (X, Y)
X and Y memories are available in the normal mode.
[X], [Y] :
STO
Stores the displayed value in the specified temporary memory (X, Y)
RCL [X], [Y] or 2ndF [ALPHA] [X], [Y] = :
Recalls the value stored in the memory corresponding to the alphabetic key
pressed.
Temporary memory contents are cleared when the mode is changed or the value 0 is
stored.
Last answer memory
The last answer memory is available in the normal and statistics mode.
The calculation result obtained by pressing = or any other calculation ending
instruction is automatically stored in the answer memory.
2ndF [ANS] : Recalls the contents of the last answer memory.
Last answer memory is cleared when the mode is changed.
Note:
Calculation results from the functions indicated below are automatically stored in
memories X or Y. For this reason, when using these functions, be careful with the use
of memories X and Y.
Random numbers....................... Y memory
→ rθ, → xy .............................. X memory, Y memory
Fractions Calculations ( → → → → page 9)
a b/c Key is used to enter a fraction or to convert a fraction to the decimal scale.
[d/c] : Used to convert a fraction a+b/c ← → d/c.
2ndF
• A decimal number or exponent cannot be entered as a fraction.
• In all cases, a total of up to 10 digits including integer, numerator, denominator and
the symbol ( ) can be entered.
• If the number of digits to be displayed is greater than 10, the number is converted to
and displayed as a decimal number.
Time, Decimal and Sexagesimal Calculations ( → → → → page 9)
Conversion between decimal and sexagesimal numbers can be performed. In addition,
the four basic arithmetic operations and memory calculations can be carried out using
the sexagesimal system.
Coordinate Conversions ( → → → → page 9
Coordinate conversion can be performed in the normal and statistics modes.
• Before performing a calculation, select the angular unit (See page 18)
θ] :Convert rectangular coordinates ( x,y ) to polar coordinates (r, θ).
2ndF [
r
[ xy ]:Convert polar coordinates (r, θ) to rectangular coordinates ( x,y ).
2ndF
5
P( x,y )
Y Y
y ←→ r
θ
0 x X 0
Rectangular Polar
Coordinates Coordinates
[,] : Used to enter the y value for rectangular coordinates or the θ value for
2ndF
polar coordinates.
, : Switches between the x and y or r and θ coordinates.
< >
The calculation result is automatically stored in memories X and Y.
Value of r or x : X memory
Value of θ or y : Y memory
Modify Function (→ → → → page 10)
In this calculator, all calculation results are internally obtained in scientific notation with
up to 12 digits for the mantissa. However, since calculation results are displayed in the
form designated by the display notation and the number of decimal places indicated, the
internal calculation result may differ from that shown in the display. By using the modify
function, the internal value is converted to match that of the display, so that the
displayed value can be used without change in subsequent operations. This function is
useful, for example, when performing calculations in which the significant digits of a
number need to be taken into account.

STATISTICAL CALCULATIONS

(→ → → → page 10)
The following statistics can be obtained (refer to the table below):
Press to select statistics mode.
MODE 2
x Mean of samples ( x data)
sx Sample standard deviation ( x data)
σx Population standard deviation ( x data)
n Number of samples
Σx Sum of samples ( x data)
Σx² Sum of squares of samples ( x data)
[Data entry]
Entered data are kept in memory until [CA] are pressed. Before entering new
2ndF
data, clear the memory contents. Alternatively, press
calculator.
P(r, θ)
X
to clear the
MODE 2
© Lexibook 2005