Question: The mean length of 6 rods is 44.2cm The mean length of 5 of them is 46cm.How long is the sixth one?
Since the mean length of 6 rods is 44.2cm, then their total length is 6*44.2 = 265.2 cm.
And since the mean length of 5 of them is 46cm, then the total length of these 5 rods is 5*46 = 230 cm.
So the difference between total lengths, 265.2 - 230 = 35.2 cm, is the length of the 6th rod.
Answer: length of the 6th rod is 35.2 cm