Its important because they show trends (growth) in data. Individual data points are less important than what you see when you put all the data together.
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who discovered mean median and mode
The mean is the average. The median is the middle. The mode is the most common.
a single number, -3, is its own mean, median, and mode.
In a symmetric distribution, the mean and the median are the same. Otherwise there is no relation. In symmetric distributions with only one mode, the mode will coincide with the mean and median, but otherwise there is no relation.
Mean: 7 Median: 6 Mode: 6