document.write( "Question 387941: A clothing store owner knows from previous records that any person who comes into her store has a 60 percent chance of making a purchase. She notes that there are 13 people in her store at the current time. What is the probability that:\r
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Algebra.Com's Answer #274352 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: P = nCx* 
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document.write( " where p and q are the probabilities of success and failure respectively. 
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document.write( "In this case p =.6 and  q = .4
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document.write( "nCx = 
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document.write( "for example:
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document.write( "P(exactly 5 people will make a purchase)= 1287(.6)^5(.4)^8 = .06559\r
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document.write( "P(less than 8 people make a purchase)  
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document.write( "1- P(8) - P(9) - P(10) - P(11)- P(12) - P(13) = .4256  (Stat Trek)\r
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document.write( "P(More than 10 people make a purchase) = P(11) +  P(12) + P(13)  
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document.write( " P(11) +  P(12) + P(13) = .04528 + .01132 + .00131 = .0579 \n" );
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