How many different statues are there? What is the chance of getting the best one?
For a given type of Statue (e.g. Gunboat Energy), the probability of the boost level in listed below.
However, the exact ability of the Statue for a given color of fragments, shards or crystals are assigned randomly, and there is no way to know ahead until it has finished building. For example, when you build a Masterpiece from 7 Dark Crystals, you cannot choose whether it is for Gunboat Energy, Resource Reward or Crystal Chance. You will only find out the ability and boost percentage when the Sculptor has finished building it.
The actual number may be off by +/- 1% because of rounding errors.