(1.) average: (6000+4000+1200+500+5000+3500+1500+600) divided by 8= (self-calculated) median: 6000,5000. The mode is a number repeated many times in a set of data, but it is not in this set of data! )

(2.) A: I think the median is better because there are extreme values in this set of data.

(3.) a: (6000+4000+1200+500) divided by 4= (calculate by yourself =A 1)B:

(5000+3500+ 1500+600) divided by 4= (calculate by yourself =B2) Final comparison: If A 1 is less than B2, go to Company B; If A 1 is greater than B2, please go to A 1.