Is there a function in R that calculate the mean and median for a grouped
data?
For example, a survey shows the oil price outlook in the future. How can I
calculate the mean/median?
(Of course, I understand that the groups "below 80" and "above 110" must be
defined more specifically)
below 80 4 80-90 5 90-100 8 100-110 7 above 110 3
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