A grocery store chain is comparing the sales of two brands of frozen pies. The monthly sales data for each brand of pie is in the back-to-back stem plot below. Which of the following statements are true?

I – on average, Brand A sells more pies each month;

II – on average, Brand B sells more pies each month;

III – on average, each brand sells the same number of pies each month;

IV – the averages are the same, but Brand B sells more pies each month.