A paragraph is a unit of thought, not of length. It makes a point, a point different from what the previous paragraph made and different from what the next one will make.
In reader-friendly reports, paragraphs make their points directly and clearly, not indirectly, deviously, or subtly. Compare these two:
In the bad paragraph the reader has no idea till the end what the point is. At first we might think it’s an account of Mr. Fnerp’s work; then we might think it’s a discussion of declining sales; then maybe something about current news. We have to grope our way through these first three sentences, wondering all the time