Recalculate ratings

Hi. I wish to compare 3 products that have the follwing scores
1) 86/100 I.e 0.86 from 1200 ratings
2) 78/100 from 100 ratings
3) 81/100 from 350 ratings.

How do I recalculate the scores after taking into account the number of ratings so that comparison becomes easier. This is one of my statistics class use cases. The case requires to recalculate the scores and recommend product 2 to improvise . Where do I start ?
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