Question: Creating a Histogram from grouped data not raw data

The built-in Histogram command in the Statistics package only creates a Histogram from raw data, unfortunately. There is however a big number of situations, where you only have grouped data with intervals and their associated frequencies (probabilities) and want to plot the Histogram. Suppose that the intervals are of equal width and (indirectly) are specified from a starting point x0, a column-width named 'width' and the number of intervals given by n. Suppose the frequencies are given by a list of size n named 'freq'.

Is there an elegant way this Histogram can be created?   

NB! Quite Recently I have asked a similar question for ungrouped data (and "line-graphs").


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