Your Practice Set – Applications and Interpretation for IBDP Mathematics
4 . The number of typing errors made by Mr . Lee in the book Your Practice Set – Applications and Interpretation Book 2 follows a Poisson distribution with mean � per page , where 0��
� 1, � � . The probability that exactly 1 typing error is made on a particular page is 0.00990 .
( a ) Find � . [ 3 ]
( b ) Hence , find the probability that more than 2 typing errors are made on a particular 120-page section .
[ 2 ]
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