给定一组学生的成绩数据(包括姓名、数学、英语、科学成绩)，计算平均成绩并按照平均成绩从高到低排序。


{name: Tom, math: 85, english: 90, science: 92},
{name: John, math: 90, english: 80, science: 95},
{name: Mary, math: 92, english: 92, science: 85},
{name: Lisa, math: 80, english: 85, science: 88}
以下是给定学生成绩数据的答案:

{name: Mary, math: 92, english: 92, science: 85}

{name: Tom, math: 85, english: 90, science: 92}

{name: Lisa, math: 80, english: 85, science: 88}

{name: John, math: 90, english: 80, science: 95}


计算平均成绩后按平均成绩从高到低排序的结果如上所示。