document.write( "Question 1206622: A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 80% of the questions correct. (Round your answer to three decimal places.) \n" ); document.write( "

Algebra.Com's Answer #844178 by ikleyn(52862) $\"\"$ $\"About$

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\n" ); document.write( "A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer.
\n" ); document.write( "Find the probability that the student passes the quiz with a grade of at least 80% of the questions correct.
\n" ); document.write( "(Round your answer to three decimal places.)
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document.write( "This is a binomial experiment with n= 10 trials and p= 0.5 probability of the individual success.\r\n" );
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document.write( "They want you determine the probability of 8 or more successes \r\n" );
document.write( "(at lest 80% score of 10 questions means 8 or more correct answers).\r\n" );
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document.write( "You can use regular calculator TI-83/84 with standard function binomcdf, or Excel function BINOM.DIST,  \r\n" );
document.write( "or free of charge online calculator https://stattrek.com/online-calculator/binomial.aspx\r\n" );
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document.write( "The ANSWER is  P = 0.05469.\r\n" );
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document.write( "Round it as you want.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved.\r
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