import math

f = open('/home/madhu/Desktop/marks.dat')

subj_marks = [[]] * 5

names = []

for line in f:

    fields = line.split(';')

    names.append(fields[2])

    for i in range(5):

        subj_marks[i].append(int(fields[i+3]))

for i in range(5):

    avg_marks = float(sum(subj_marks[i])) / len(subj_marks[i])

    student = names[subj_marks[i].index(max(subj_marks[i]))]

    sigma = 0

    for j in subj_marks[i]:

        sigma += (j - avg_marks) ** 2

    std_dev = math.sqrt(sigma)

    print "Average marks for subject: %f is Standard Deviation is %f, Student with Highest Marks is %s" % (avg_marks, std_dev, student)