Question 1138211
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9 + 7 + 6 + 8 = 30 coins, in all.


The probability to randomly select a quarter is  {{{9/30}}};

The probability to randomly select a dime    is  {{{7/30}}};


    . . . .  and so on  . . . . 


The expected value of the experiment is


{{{25*(9/30) + 10*(7/30) + 5*(6/30) + 1*(8/30)}}} = {{{(25*9 + 10*7 + 5*6 + 1*8)/30}}} = {{{333/30}}} = {{{111/10}}} = 11.1 cents.    <U>ANSWER</U>
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