Sharp EL-531LH - Statistical Calculations; Mean and Standard Deviation (Single Data)

24 Mastering the Calculator using the Sharp EL-531LH
Example 2
calculate the following:
to clear the memory press
press the following keys:
your answer should be 11.39917438
(There are other memory keys in your calculator – the X, Y keys, accessed by using STO and
RCL – try them yourselves.)
Example
and
or
and
10. Statistics
10.1 Mean and standard deviation – single data
The formula for the mean is
The formulas for the sample standard deviation are
(Theoretical formula)
(Working formula)
18
17
-
---------
17
17
----------
12
1
7
------
----
++
x
Σ
x
n
--
----
=
s
Σ x
i
x–()
2
n 1–
--------------------
----
=
s
Σx
i
2
Σx
i
()
2
n
⁄–
n 1–
-----------------------------------
----
=