document.write( "Question 1080686: The mean of 10 boys in a class is 70% whereas all the mean marks of 15 girls is 60%. The mean mark of all the 25 students is \n" ); document.write( "

Algebra.Com's Answer #694810 by Fombitz(32388) $\"\"$ $\"About$

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S0 then the total score for the boys is,
\n" ); document.write( " $\"T%5Bb%5D=10%2A70=700\"$
\n" ); document.write( "and for the girls,
\n" ); document.write( " $\"T%5Bg%5D=15%2A60=900\"$
\n" ); document.write( "So all together,
\n" ); document.write( " $\"T=T%5Bb%5D%2BT%5Bg%5D\"$
\n" ); document.write( " $\"T=700%2B900\"$
\n" ); document.write( " $\"T=1600\"$
\n" ); document.write( "Now divide by the total number of students,
\n" ); document.write( " $\"mu=1600%2F%2810%2B15%29\"$
\n" ); document.write( "Work that out for the answer. \n" ); document.write( "

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