Please can anyone help with this stats problem its killing me

Statistics
Tutor: None Selected Time limit: 1 Day

Apr 20th, 2015

a.  Positive

  Y  N

Has Disease  99  1

Disease-free  200  9800

b. 99/(99+200)=99/299, approxximately 1/3

c.1/(9800+1); approximately .0001


Apr 20th, 2015

thanx i got one more question if you dont mind?20150420_122350.jpg

Apr 20th, 2015

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