It gives a measure of the spread of the data.you
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It's impossible to tell unless we have both the graph and the set of data.
The median is the midpoint of the data set. So half the observations are greater than the median and half are smaller.
Range tells you the interval in which the f(x) values are found.
It tells you that middle half the observations lie within the IQR.
It tells you how much variability there is in the data. A small standard deviation (SD) shows that the data are all very close to the mean whereas a large SD indicates a lot of variability around the mean. Of course, the variability, as measured by the SD, can be reduced simply by using a larger measurement scale!