Statistics - Sharp EL-531LH Mastering Instructions

24
Mastering the Calculator using the Sharp EL-531LH
Example 2
calculate the following:
18 17 12
--------- - --------- - --------- -
+ +
17 17 17
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
Σ x (
s = ----------------------- -
n 1
Σx
2
i
s = -------------------------------------- -
Σx
x ----- -
=
n
2
)
– x
i
–
2
( Σx ) n ⁄
–
i
n 1 –
(Theoretical formula)
(Working formula)