Expectation and variance of a discrete random variable
 

Expectation and variance of a discrete random variable problem 6


Kai has a spinner with four sides, labelled 1, 2, 3, 4. When the spinner is spun, the score is the number on the side on which the spinner lands. The random variable denotes this score. The probability distribution table for is given below.




Find the numerical value of .


 

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