SOLUTION: In a school, three out of one thousand students reacted to a newly manufactured vaccine against an endemic disease. If 2000 students were treated with this vaccine, find the probab

Question 1131782: In a school, three out of one thousand students reacted to a newly manufactured vaccine against an endemic disease. If 2000 students were treated with this vaccine, find the probability that:
(i) Exactly one student reacts to the vaccine
(ii) At most one student reacts to the vaccine
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
For 2000,
Binomial 2000C1(.003)^1*(0.997)^1999=0.0049
At most 1 student reacts, get the probability of 0 students, which is 0.997^2000=0.0025
That is 0.0074 when added.
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