“Expectation and variance of a discrete random variable”
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Jasmine has one coin, two coins and two coins. She selects two of these coins at random. The random variable is the total value, in dollars, of these two coins. Find the value of .
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coin, two 
coins and two 
coins. She selects two of these coins at random. The random variable 
is the total value, in dollars, of these two coins. Find the value of 
.
