import statistics as st
xlist = []


def data_to_numeric(flist):
    for i in flist:
        xlist.append(float(i))
    return xlist


with open('inputdata.txt', 'r+') as fin:
    with open('outputdata.txt','w', encoding='utf-8') as fout:
        content = fin.read().splitlines()
        fout.write('Μέσος όρος= ' + str(round(st.fmean(data_to_numeric(content)),3))+'\n')
        fout.write('Τυπική απόκλιση= ' + str(round(st.stdev(data_to_numeric(content)),3))+'\n')