Electron microscopy
Random Variable
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In machine learning, a random variable is a variable whose possible values are outcomes of a random phenomenon. In other words, it is a variable that can take on different values based on the outcome of a random event. Random variables play a crucial role in probability theory and statistics, which are foundational concepts in machine learning. 

There are two types of random variables: 

         i) Discrete Random Variable:    

This type of random variable can take on a countable number of distinct values. For example, the outcome of rolling a six-sided die is a discrete random variable because the possible values are 1, 2, 3, 4, 5, and 6. 

         ii) Continuous Random Variable: 

This type of random variable can take on any value within a range. For example, the height of a person is a continuous random variable because it can take any real value within a certain range. 

Random variables are used to model uncertainty and variability in data. In machine learning, they are often used in the probability distributions to represent the likelihood of different outcomes. Understanding and working with random variables are essential for building probabilistic models and making predictions based on uncertain data.