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itzdulceee
31.10.2019 •
Mathematics
Amedical researcher is studying the spread of a virus in a population of 1000 laboratory mice. during any week, there is a 90% probability that an infected mouse will overcome the virus, and during the same week there is a 30% probability that a noninfected mouse will become infected. one hundred mice are currently infected with the virus.
how many will be infected next week and in 2 weeks?
(a) next week
mice
(b) in 2 weeks
mice
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Ответ:
a) 280
b) 244
Step-by-step explanation:
a)
One hundred mice are currently infected with the virus and 900 are okay, so next week we should have 30% of 900 = 270 new infected mice and 90% of 100 = 90 recovered mice for a total of 370 - 90 = 280 infected mice.
b)
The following week we should have 30% of 1000 - 280 = 30% of 720 = 216 new infected mice and 90% of 280 = 252 recovered mice for a total of 280 + 216 - 252 = 244 infected mice.
Ответ:
y = - 128
Step-by-step explanation: