Recommend a statistics fundamentals book
Solution 1:
Freedman, Pisani and Purves, Statistics, followed by Freedman, Statistical Models.
Solution 2:
Alex i recommend you these two books:
Introduction to Probability by Sheldon Ross
An Introduction to Probability Theory and Its Applications: William Feller
Both are very good books for an introductory level and the second one is a classic. It's referred by many people.
Solution 3:
Many people recommend the book All of Statistics: A Concise Course in Statistical Inference by Wasserman.