If you look at this add-on:

http://xenforo.com/community/resources/sonnb-xengallery-xenforo-gallery.2076/reviews

There are 33 reviews.

31 reviews = 5 starts

2 review s = 4 stars

Overall rating 4.5 stars.

If 5 stars represent 100%, then the average is:

31*5 = 155

2*4 = 8

155+8 = 163 then divide by 33 = 4.93. Thus, it should be 5 stars rating, and it shouldn't be 4.5 stars.

Even if we consider only 24 votes (because people voted twice):

22 reviews = 5 stars

2 reviews = 4 stars

22 * 5 = 110

2 * 4 = 8

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118/24 = 4.916, still should be 5 stars.

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