sum_emojixpress = 0
sum_instagram = 0
sum_twitter = 0
for row in data:
    sum_emojixpress += row[1]
mean_emojixpress = sum_emojixpress / len(data)


for row in data:
    sum_instagram += row[2]
mean_instagram = sum_instagram / len(data)


for row in data:
    sum_twitter += row[3]
mean_twitter = sum_twitter / len(data)