ch8 ex5

marks_students = {
#student : list of marks in Maths, Science, English, Arts, Physcial Education
"adam" : [95, 92, 85, 72, 80],
"mary" : [66, 95, 63, 95, 90],
"john" : [87, 88, 76, 96, 70],
"chua" : [77, 96, 92, 89, 75],
"loui" : [92, 67, 77, 84, 85],
"mark" : [65, 88, 74, 93, 95],
"sara" : [99, 77, 87, 87, 80],
"chia" : [82, 75, 89, 85, 85],
"bran" : [75, 63, 83, 98, 90],
"lara" : [62, 92, 82, 80, 95]
}

def subAvg(marks,subindex):
    sum =0
    for marklist in marks.values():
        sum+=marklist[subindex]
    return sum

def stuAvg(marks,key):
    sum=0
    for i in marks[key]:
        sum=sum+i
    sum=sum/len(marks[key])
    return sum