document.write( "Question 1148849: A commercial jet has four engines. For an air craft in flight to land safely, at least two engines would be working condition. Each engine has an independent proabability of 92%. what is the probability that an air craft in flight can land safely? \n" ); document.write( "

Algebra.Com's Answer #770239 by ikleyn(52803) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "Probability to land safely is the sum of these addends\r\n" );
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document.write( "    probability  of all 4 engines work properly,  PLUS\r\n" );
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document.write( "    probability some 3 engines work properly AND one not, PLUS\r\n" );
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document.write( "    probability some 2 engines work properly AND two others not.\r\n" );
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document.write( "The formula is\r\n" );
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document.write( "    P(land safely) =  +  +  = \r\n" );
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document.write( "                   =  = 0.998075.     ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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\n" ); document.write( "\n" ); document.write( "Very practical problem !\r
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\n" ); document.write( "\n" ); document.write( "Wish you and all participants of this forum safe landing (!)\r
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