document.write( "Question 1140366: A piggy bank contains a quarter, two dimes, a nickel, and three pennies. If one coin
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document.write( "is taken randomly out of the bank, then replaced, and then a second coin is drawn, what
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document.write( "is the probability that the total value drawn is at least 30 cents? \n" );
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Algebra.Com's Answer #760878 by greenestamps(13200)![]() ![]() You can put this solution on YOUR website! \n" ); document.write( "There are 7 coins; the probability of choosing any one particular coin on each draw is 1/7. The probability of specific outcomes on two successive draws is (1/7)*(1/7) = 1/49. \n" ); document.write( "Count the number of outcomes with a total of 30 cents or more using an organized list. \n" ); document.write( "Two things I can think of that you want to consider when making your list: \n" ); document.write( "(1) at least one of the coins drawn must be the quarter \n" ); document.write( "(2) quarter then dime (for example) is a different outcome than dime then quarter \n" ); document.write( "Then if you count 10 cases where the total is 30 cents or more (for example; not the right answer!), the answer to the question would be 10/49. \n" ); document.write( " |