# using scientific calculator to calculate mean, and standard deviation

If you have the scientific calculator fx-570MS, you can use it to easily  calculate mean and standard deviation of a given set of data.

Let’s say you have a sample with the given set of data such as:

60, 70, 85, 52, 93, 58 , 71 (n=7)

and you want find the mean and standard deviation.

The first thing you need to do is to

clear all data: shift, mode, 3 (All) =

and set mode to statistics: mode, mode, 1 (SD)

then you can begin to key in the data:

just type the number and press m+ which mean add memory

60 m+, after you press m+, then n=1 will appear on the screen. this means that the sample number you have added into your calculator is 1, and 60 is your first sample.

70  m+

85  m+

52 m+

93 m+

58 m+

71 m+

at the end , your n should be n=7

Then, to find your mean just press

shift 2 (s-var), 1 (x bar), =

and the mean is 69.86

to find the standard deviation, just press

shift, 2 (s-var), 2 (xsigman), = 13.746 if your data is considered to be population

shift, 2 (s-var), 3 (x sigma n-1), =14.84  if you data is a sample.

Therefore, you need to be aware about the data set that you have, whether it is a sample or population. (In this case, you need to find the standard deviation for a sample, so you should select 3 (x sigma n-1) ).

so, here it is, simple right!