Down syndrome

Down syndrome is one of the serious diseases caused by a gene mutation. Down syndrome occurs in approximately every 550-born child. Express the incidence of Down's syndrome in newborns at per mille.

Result

p =  1.818 ‰

Solution:

p=1000⋅ 1550=2011≐1.8182≐1.818 ‰p=1000 \cdot \ \dfrac{ 1 }{ 550 }=\dfrac{ 20 }{ 11 } \doteq 1.8182 \doteq 1.818 \ ‰

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