Free Data Mining Tools Beginners to learn

I am doing BCA.And i have a subject called ETT(Emerging Tools and Technologies)..in which i want free or open source data mining tool to do following practicals....can anyone suggest one?? List of practicals 1) Overview of XLMiner 2) Plotting and analysis of data using statistical techniques Box Plot 3) Plotting and analysis of data using statistical techniques Histogram 4) Plotting and analysis of data using statistical techniques Matrix Plots 5) Data Partition Strategies for Data Mining Task 6) Sampling of the data for statistical inference 7) Missing Data Handlining in Data Mining 8) Analysis of time series data 9) Regression techniques for data prediction 10) Presentation on emerging trends in the field of computer science