document.write( "Question 393180: A baseball player has a batting average of 0.17. What is the probability that he has exactly 4 hits in his next 7 at bats?\r
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\n" ); document.write( "\n" ); document.write( "(1 pt) You flip a fair coin 10 times. What is the probability that it lands on heads exactly 3 times? \r
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\n" ); document.write( "\n" ); document.write( "What is the probability that it lands on heads at least 3 times?\r
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Algebra.Com's Answer #279095 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. In this case p =.17 q = .83
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document.write( "nCx = 
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document.write( "P(exactly 4 hits out of 7 at bat) = 35(.17)^4(.83)^3 = .0167\r
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document.write( "Coin experiment p and q = 1/2 or .5
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document.write( "P(3 heads out of 10 flips) = .1172 =  120*(.5)^3(.5)^7
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document.write( "P(at least 3 heads out of 10 flips) = .9453 = 1-P(0)-P(1)-P(2) \n" );
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