document.write( "Question 1178702: A quiz consists of 20 true or false questions. If the student guesses on each question, what is the Variance and the standard deviation of the number of
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Algebra.Com's Answer #808120 by ewatrrr(24785)\"\" \"About 
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document.write( "20 t or false questions guessed.  p(correct answer) =  1/2 \r\n" );
document.write( "mean =  20(1/2) = 10\r\n" );
document.write( "variance = 10(1-p) = 10(1/2) = 5\r\n" );
document.write( "sd = √5 =    \r\n" );
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