英语翻译The numbers of cars sold at a certain dealership on six

英语翻译
The numbers of cars sold at a certain dealership on six of the last seven business days were 4,7,2,8,3,and6,respectively.If the number of cars sold on the seventh business day was either 2,4,or 5,for which of the three values does the average number of cars sold per business day for the seven business days equal the median number of cars sold per day for the seven days?
the last seven business days到底是一周前6天还是后六天啊