Introduction to Statistics chapter 3 part 4 in Amharic Median and Quantiles( በአማርኛ)

Introduction to Statistics chapter 3 part 4 in Amharic Median and Quantiles(Quartile,Decile and percentile) በአማርኛ,average value,mean of an observation,simple artimetic mean,weighted artimetic mean,combined mean,geometric mean,how can we compute mean,how can we compute grouped frequency distribution mean,how can we compute harmonic mean and its definition,what is mean and its function,what is the difference between mean median and mode,what is the difference between median and other quantiles like quartile,decile and percentile,can we find all quartiles deciles and percentiles in each observation