Citizen SR-135N Instruction Manual page 10

e. (R → P Conversion)
([x, y] → [r, θ ])
Key operation Display
x x
a x
y y
b y
R → P
b
θ
(23) Statistical calculation mode ([SHIFT]
a. When you calculate the calculation of statistics, pressing
SD
[SHIFT] keys for statistics mode ("SD" sign ). When
[ ]
ON/C
you clear to statistics mode, press the same keys ([SHIFT]
SD
).
[ ]
ON/C
b. You can't perform the memory calculation, parenthesis
calculation or conversion of coordinates.
c. [DATA] : Data entry key.
d. you can calculate the following statistical volume in this
calculator.
1. n : Number of data (Number of sample).
2. Σ x : Total of datum.
2
3. Σ x
: Total of square of each data.
4. x : Average of datum.
5. σ
: The sample standard deviation of the data.
n–1
6. σ
: The population standard deviation of the data.
n
n
∑
(
σ =
= i 1
−
n 1
n
∑
( xi
σ i = 1
=
n
SR135_English_090326.rtf
2009/3/26
f. (P → R Conversion)
([r, θ ] → [x, y])
Key operation Display
θ
b
r
a
r P → R
b
SD
).
[ ]
ON/C
[DEL] : Data clear key.
n
∑
xi
Σ
x
=1
i
= =
x
n n
2
−
xi x )
2 2
Σ − Σ
x ( x / ) n
=
− −
n 1 n 1
2
−
x )
2 2
Σ − Σ
x ( x / ) n
=
n n
-
E9 -
SIZE : 140x75mm
θ
θ
r
r
x
y
SCALE 2:1