SAT数学题,请问这题什么意思Thetableaboveshowshowmanystudentsinaclassof12preschoolershad0,1,2,or3siblings.Later,anewstudentjoinedtheclass,andtheaverage(arithmeticmean)numberofsiblingsperstudentbecameequal

Question

SAT数学题,请问这题什么意思
The table above shows how many students in a class of 12 preschoolers had 0,1,2, or 3 siblings. Later, a new student joined the class, and the average (arithmetic mean) number of siblings per student became equal to the median number of siblings per student. How many siblings did the new student have?
图就不上了,请给我翻译一下

Answer 1

上面的这个表格表明了在这个12人的学前儿童的班级中,有几个学生拥有0、1、2或3个兄弟姐妹.后来,有一个新学生加入这个班级,然后每个学生拥有的兄弟姐妹数量的平均数（算术平均数）就变得与每个学生拥有的兄弟姐妹数量的中位数相等.新来的学生有几个兄弟姐妹?