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8-6
Standard deviation
With the function mode selector at the "SD(o}" position, the calculator
automatically computes standard deviation (o), arithmetical mean (x),
number of data {«}, sum of square (Ex2) and sum (£x) by operation
of Entry (data) Q and each answer is retrieved by depression of the Q
key and appropriateCD,ED>
SB & C3
keys, symbolized for their function.
* Be sure to depress the GB key prior to starting a standard deviation
function.
* Depression of theQ.QS.Q, Q or Q is not restricted to order.
427.
* To enter a data as a negative figure, operate Data OB in sequence.
v To correct the data after depressing the Q key, depress the 0 key
successively and re-enter the data correctly.
EXAMPLE
OPERATION
READ-OUT
Mm
——
mu i
.. i i
To find Standard deviation and arithme¬
tical mean based on the data: 1.2, —0.9,
-1.5, 2.7, -0.6.
"SD(o)" "F"
8B1020O9O0
105BB2Q7B
(mistake)
10600
(To correct) Q
0600
rn
Q
Note: The calculator computes the standard deviation (a) based on
the formula:
If the S,D. is required on the formula
in the above example, operate as follows.
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