document.write( "Question 395744: what is the probability of 4 calculator batteries with a 90% chance of lasting one year? \n" ); document.write( "

Algebra.Com's Answer #280835 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "Note: The probability of x successes in n trials is: 
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document.write( "P = nCx*  where p and q are the probabilities of success and failure respectively. 
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document.write( "In this case p = .9 and q = .1 
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document.write( "nCx = 
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document.write( "P(4 out of 4 lasting one year) = (.9)^4 = .6561 \n" );
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