A VARIATE X HAS THE PROBABILITY DISTRIBUTION FIND E(X) AND E(2X+1)?

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SOLUTION EXPLANATION:
WE KNOW THAT MEAN =EXPECTED VALUE
=E(X)
=summation x into p(x)
WE KNOW THAT WHEN THE TWO VARIABLES a,b AND A CONSTANT x IS GIVEN THEN THE FORMULA IS E(ax+b)=aE(x)+b
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