document.write( "Question 1174544: Let x be a random variable that denotes the number of tails obtained when three coins are tossed? \r
\n" ); document.write( "\n" ); document.write( "a. Find E(X) = ........ I solved this one, 1.5\r
\n" ); document.write( "\n" ); document.write( "b. Find the P(x < or = to 2) for the random variable \r
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Algebra.Com's Answer #799966 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "Hi\r\n" );
document.write( "  Binomial Theorem\r\n" );
document.write( "       N = 3 coins tossed               p(H)=1/2   and q(T)=1/2 \r\n" );
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document.write( " P(x ≤ 2) = P(x=0) + P(x=1) + P(x=2)\r\n" );
document.write( "P(x=0) + P(x=1) + P(x=2) = 3C0(1/2^)3 + 3C1(1/2)^3 + 3C2(1/2)^3 \r\n" );
document.write( "     (1/8) + (3/8) + (3/8)  = .875\r\n" );
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document.write( "  P(x < 5) = 1   \r\n" );
document.write( " NOte: P(x=0) + P(x=1) + P(x=2) + P(x=3) = .875 + .125 = 1\r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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