document.write( "Question 1131715: : In a college 25% of students have failed their Math 15%
\n" ); document.write( "failed Chemistry and 10% failed both Math and Chemistry
\n" ); document.write( "classes. If a student is selected at random and:
\n" ); document.write( "a) He/she has failed Chem class, what is the probability that
\n" ); document.write( "he/she also has failed Math class?
\n" ); document.write( "b) What is the probability that he/she has failed Math or
\n" ); document.write( "Chem Class?
\n" ); document.write( "c) What is the probability that he/she has failed neither Math
\n" ); document.write( "nor Chem class?
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #748395 by ikleyn(52778)\"\" \"About 
You can put this solution on YOUR website!
.
\n" ); document.write( "
\r\n" );
document.write( "a)  P = \"P%28M+n+C%29%2FP%28C%29\" = \"0.1%2F0.15\" = \"2%2F3\" = 0.6667 = 66.67%  (approx.)\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "b)  P = P(M) + P(C) - P(M n C) = 0.25 + 0.15 - 0.10 = 0.30 = 30%.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "c)  P = the COMPLEMENT to b) = 1 - 0.3 = 0.7 = 70%.\r\n" );
document.write( "
\r
\n" ); document.write( "\n" ); document.write( "Answered and solved.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );