//求平均数 var pjs=[ ['小明',87], ['小红',81], ['小花',97], ['小天',76], ['小张',74], ['小小',94], ['小西',90], ['小武',76], ['小迪',64], ['小曼',76] ] var i,j; var sum=0; for(var i=0;i<pjs.length;i++){ for(j=0;j<pjs[i].length;j++) { if(j==pjs[i].length-1) { sum+=pjs[i][j]…