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ghlin96
14.09.2019 •
Mathematics
Atest tube contains 25 bacteria, 5 of which are can stay alive for atleast 30 days, 10 of which will die in their second day. 10 of which are already dead.
given that a randomly chosen bacteria for experiment is alive. what is the probability it will still be alive after one week?
(a)1 ⁄ 3(b)2 ⁄3
(c) 1⁄5 (d)4 ⁄5
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Ответ:
c.![\frac{1}{5}](/tpl/images/0231/2718/2c7f0.png)
Step-by-step explanation:
Given,
Number of bacterias who alive for at least 30 days = 5,
Bacterias who alive for 2 days = 10,
Died bacterias = 10,
Total bacterias = 5 + 10 + 10 = 25,
Ways of choosing a bacteria =
=
= 25,
While, ways of choosing of a bacteria who will live after 1 week =
=
= 5,
Hence, the probability it will still be alive after one week =
= ![\frac{1}{5}](/tpl/images/0231/2718/2c7f0.png)
OPTION C is correct.
Ответ: