document.write( "Question 1025114: The table shows the probability distribution for the number of heads when four coins are tossed. What is the probability that no more than two heads show on a random toss?\r
\n" ); document.write( "\n" ); document.write( "X = Number of Heads: 0, 1, 2, 3, 4
\n" ); document.write( "Probability: 0.0625, 0.25, 0.375, 0.25, 0.0625\r
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\n" ); document.write( "\n" ); document.write( "My Work: My answer was 0.3125 because worked it out like this
\n" ); document.write( "P(X<2) = P(X=0) + P(X=1)
\n" ); document.write( " = 0.0625 + 0.25
\n" ); document.write( " = 0.3125
\n" ); document.write( "I just want to make sure that I have it right. Thank you for helping me. \n" ); document.write( "
Algebra.Com's Answer #640433 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "No, the problem states \"no more that 2\", not \"less than 2\".\r\n" );
document.write( "That's \"less than or equal 2\".  So it's P(X ≤ 2), not P(X < 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( "= 0.0625 + 0.25 + 0.375\r\n" );
document.write( "= 0.8675\r\n" );
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document.write( "Edwin
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