let marks = [
    {
        name: 'student1',
        mark: 78
    },{
        name: 'student2',
        mark: 90
    },{
        name: 'student3',
        mark: 69
    },{
        name: 'student4',
        mark: 96
    },{
        name: 'student5',
        mark: 64
    }
]