score_dic = {'john': 100, 'mary': 90, 'danny': 80}
score_values=score_dic.values()
score_list=list(score_values)

score_sum=sum(score_list)
print(score_sum)
score_len=len(score_list)
print(score_len)
score_avg=score_sum/score_len
print(score_avg)
