document.write( "Question 1182503: An auto salesperson sells on average 4.2 cars per month. Find the probability that during a given month, the salesperson will sell less than three cars. \n" ); document.write( "

Algebra.Com's Answer #812569 by Boreal(15235) $\"\"$ $\"About$

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assuming this is a Poisson distribution, this is looking for 0,1,2 cars with a parameter of 4.2
\n" ); document.write( "p(0)=e^(-4.2)=0.015
\n" ); document.write( "p(1)=e^(-4.2)*4.2^1=0.0630
\n" ); document.write( "p(2)=e^(-4.2)*4.2^2/2=0.1323
\n" ); document.write( "That sum is 0.2103
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\n" ); document.write( "Also, calculator 2ndVARSpoissoncdf(4.2,2)=0.2102, the same result although less rounding here than above. \n" ); document.write( "

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