说明：  m个人的成绩存放在score数组中，请编写函数fun，它的功能是：将低于平均分的人数作为函数值行会，将低于平均分的分数放在below所指的数组中
(m individual performance score stored in the array, write the function fun, its functions are: to be lower than average values ​ ​ as a function of the number of guilds, will be lower than average scores on the array referred to below)