Pls, help with this question if you think you the best at math (geometry). When you explain your work please don't make it too much.

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Apair of ordinary dice is rolled. what is the probability that each die will show a number higher than 4. 1. (1/36) 2. (1/12) 3. (1/6) 4. (1/4) 5. (1/3)

If the discriminant if a quadratic equation is 4 which statement describes the roots?