document.write( "Question 1152862: A multiple-choice quiz has 15 questions, each with 4 possible answers of which only one is correct. What is the probability that a student gets at least 1 correct answer? \n" ); document.write( "

Algebra.Com's Answer #774976 by ikleyn(52817) $\"\"$ $\"About$

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document.write( "For each of 15 questions, the probability to guess randomly the correct answer is .\r\n" );
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document.write( "The probability to answer incorrectly all 15 questions is   = 0.013363\r\n" );
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document.write( "The probability to get at least 1 correct answer is the COMPLEMENT\r\n" );
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document.write( "    P = 1 -  = 1 - 0.013363 = 0.986637.    ANSWER\r\n" );
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