emojixpress_sum = 0
instagram_sum = 0
twitter_sum = 0
for row in data:
    emojixpress_sum += row[1]
    instagram_sum += row[2]
    twitter_sum += row[3]

emojixpress_mean = emojixpress_sum / len(data)
instagram_mean = instagram_sum / len(data)
twitter_mean = twitter_sum / len(data)