THE WORD 'average' is familiar to all of you I'm sure, as in the average yield per mu of farm crops. And of course you know how to calculate it by adding yields of different plots and dividing the...
Please login first!
THE WORD 'average' is familiar to all of you I'm sure, as in the average yield per mu of farm crops. And of course you know how to calculate it by adding yields of different plots and dividing the...