Citizen SR-135N/F Instruction Manual page 10

e. (R → P Conversion)
([x, y] → [r, θ ])
Key operation
x
a
y
b
R → P
b
(23) Statistical calculation mode ([SHIFT]
a. When you calculate the calculation of statistics, pressing
[SHIFT]
[
When you clear to statistics mode, press the same keys
([SHIFT]
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
σ
SR135_English_090326.rtf
2011/12/29
Display
x
x
y
y
r
θ
SD
keys for statistics mode ("SD" sign ).
]
ON/C
SD
).
[ ]
ON/C
n
∑
xi
=1
= i
x
n
n
∑ 2
−
( xi x )
=
i 1
=
−
n 1
−
n 1
n
∑ 2
−
( xi x )
=
σ
= i 1
n
n
-
E9 -
SIZE
f. (P → R Conversion)
([r, θ ] → [x, y])
Key operation
θ
b
r
a
P → R
b
SD
).
[ ]
ON/C
[DEL] : Data clear key.
Σ
x
=
n
2 2
Σ − Σ
x ( x / ) n
=
−
n 1
2 2
Σ − Σ
x ( x / ) n
=
n
: 140x75mm
Display
θ
θ
r
r
x
y
SCALE 2:1