5. The main purpose of the NumPy library is to: Achieve scientific computations. Construct machine learning models. Perform computations on arrays efficiently. Visualize results in 2D and 3D plots.

The main purpose of the NumPy library is to perform computations on arrays efficiently. While it can be used for scientific computations, constructing machine learning models, and visualizing results in 2D and 3D plots, its primary focus is on providing efficient array operations.