Normal (or Gaussian) distributions are widely used in practice because many sets of observations follow a bell-shaped curve.In statistics, the normal distribution is one of the main assumptions in statistical inferences, such as confidence intervals and hypothesis tests.

After conducting some basic searches using scholarly articles, explain how normal distributions are used in business analytics. Your findings must include:

1. The problem background
2. Why a normal distribution is used
3. How is a normal distribution used?
4. What are the results?