document.write( "Question 1197430: Forty-three percent of marriages end in divorce. You randomly select 15 married couples. Find the expected number of marriages that will end in divorce.\r
\n" ); document.write( "\n" ); document.write( "Suppose an exam consisted of 10 multiple choice problems, each with five possible responses (A-E), only 1 of which is correct. If a student randomly guesses the answers to each question then what is the probability that a student guesses the correct answer to exactly 7 questions? Additionally, what is the probability that a student passes the exam with a score of 70% or higher? (round to 5 decimal places) \n" ); document.write( "

Algebra.Com's Answer #830699 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( " .43*15 = 6.45  will end up in divorce (more than six and less than 7)\r\n" );
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document.write( " n = 10   p(correct answer by guessing) = 1/5 = .2\r\n" );
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document.write( " P(guessing exactly 7 of the 10 correctly) = .0008\r\n" );
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document.write( "P(a student passes the exam with a score of 70% or higher)\r\n" );
document.write( " P = 1 - P(x ≤ 6) = 1- .9991\r\n" );
document.write( "Not likely for sure\r\n" );
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