Hello I also am learning how to use mathematica to do something elementary statistics, so I would like to learn together, if your want, I would like to try to help you in your project.

Some commands that you can use are:

Mean,Median,Variance, StandardDeviation,Covariance,Quantile,Kurtosis,Skewness.

Looking at the documentation there may be the command that you need,there are many commands that can deal with and which are already programmed in mathematica

Thank so much Luis, yes I want ,this commands which I need , how I can program it ??? give me some basic commands to understand that

Also we have another commands like : the frequency distribution and graph it by( histogram . polygon , pie graph),p-th percentiles,box plot .

Project:" use mathmatica7 to write 20 commands to make presentation , 10 in statistic and 10 in in what we learn in university" . I can do what I learn but I need your help to do other 10 commands .Thanks in advance