CITIZEN SR-135NPU User Manual
Page 10
SR135_English_090326.rtf SIZE : 140x75mm SCALE 2:1
2009/3/26
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E9 -
e. (R→P Conversion)
([x, y] → [r,θ])
f. (P→R Conversion)
([r,θ] → [x, y])
Key operation
Display
Key operation
Display
x x θ
θ
a x b θ
y y r r
b y a r
R→P
r
P→R
x
b
θ
b y
(23) Statistical calculation mode ([SHIFT]
[
]
ON/C
SD
).
a. When you calculate the calculation of statistics, pressing
[SHIFT]
[
]
ON/C
SD
keys for statistics mode ("SD" sign ). When
you clear to statistics mode, press the same keys ([SHIFT]
[
]
ON/C
SD
).
b. You can't perform the memory calculation, parenthesis
calculation or conversion of coordinates.
c. [DATA] : Data entry key.
[DEL] : Data clear key.
d. you can calculate the following statistical volume in this
calculator.
1. n : Number of data (Number of sample).
2.
Σx : Total of datum.
3.
Σx
2
: Total of square of each data.
4.
x : Average of datum.
5.
σ
n–1
: The sample standard deviation of the data.
6.
σ
n
: The population standard deviation of the data.
n
x
n
xi
x
n
i
Σ
=
=
∑
=1
1
/
)
(
1
)
(
2
2
1
2
1
−
Σ
−
Σ
=
−
−
=
∑
=
−
n
n
x
x
n
x
xi
n
i
n
σ
n
n
x
x
n
x
xi
n
i
n
/
)
(
)
(
2
2
1
2
Σ
−
Σ
=
−
=
∑
=
σ