Need answer for this please

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.

How do you find principle and simple interest

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8