document.write( "Question 1157921: c. The manufacturer of the disk drives in one of the well-known brands of microcomputers expects 4% of the disk drives to malfunction during the microcomputer’s warranty period. Calculate the probability that in a sample of 200 disk drives, that not more than three will malfunction. Assume Poisson distribution. \n" ); document.write( "

Algebra.Com's Answer #780873 by Boreal(15235) $\"\"$ $\"About$

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Poisson has a parameter of 0.04
\n" ); document.write( "for 200, would expect a parameter of 8, since the errors are proportional to the sample size.
\n" ); document.write( "with a parameter 8, want prob. of 0,1,2,3
\n" ); document.write( "this is 0.0423 from the calculator\r
\n" ); document.write( "\n" ); document.write( "Can do it by hand
\n" ); document.write( "e^(-8)*8^0/0! for 0 failures and that probability is 0.0003
\n" ); document.write( "e^(-8)*8^1/1!=0.0027
\n" ); document.write( "e^(-8)*8^2/2!=0.0107
\n" ); document.write( "e^(-8)*8^3/3!=0.0286\r
\n" ); document.write( "\n" ); document.write( "And that sum is 0.0423\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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