document.write( "Question 847529: the number of typographical error per page in a manuscript in poisson distributed with a mean of 0.20 per page. determine the probability on a given page, A.) there are exactly 3 typographical errors B.) there are at most 2 typographical errors \n" ); document.write( "
Algebra.Com's Answer #510509 by swincher4391(1107)\"\" \"About 
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This sounds like a poisson question.\r
\n" ); document.write( "\n" ); document.write( "If we have that \"lambda+=+0.2\"\r
\n" ); document.write( "\n" ); document.write( "Then we can look at P[X=n] = \"%28e%5E%28-lambda%29+%2A+lambda%5En%29%2F%28n%21%29\"\r
\n" ); document.write( "\n" ); document.write( "And so P[X=3] = \"%28e%5E%28-0.2%29+%2A+0.2%5E3%29%2F%283%21%29++=+highlight%28.0011%29+\"\r
\n" ); document.write( "\n" ); document.write( "P[X<=2] = P[X=0] + P[X = 1] + P[X=2]\r
\n" ); document.write( "\n" ); document.write( "I'll factor out \"e%5E%28-0.2%29\"\r
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