In a sample of size 40, the sample mean is 15. In this case, the sum of all observations in the sample is 
Xᵢ = 600.
Definitions:
Supervised Learning
A type of machine learning where a model is trained on a labeled dataset, meaning each training example is paired with an output label.
Machine Learning
A branch of artificial intelligence focused on building systems that learn from and make decisions based on data.
Hardware
The physical components of a computer system, such as the processor, memory modules, and input/output devices.
Programs
Instructions written by programmers that computers use to perform specific tasks or operations.
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