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hannahchristine457
20.11.2019 •
Mathematics
Asample of bacteria is decaying according to a half-life model. if the sample begins with 80 bacteria and after 10 hours or 20 bacteria, what is the approximate half life and hours round to the nearest integer.
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Ответ:
5 hours
Step-by-step explanation:
After 10 hours, the number of bacteria drops from 80 to 20. That's a factor of ¼, so 2 half lives must have passed (½ × ½ = ¼). If 10 hours equals 2 half lives, then 1 half life is 5 hours.
We can show this with the half life equation:
A = A₀ (½)^(t / T)
20 = 80 (½)^(10 / T)
¼ = (½)^(10 / T)
10 / T = 2
T = 5
Ответ:
Step-by-step explanation:
This is a question from conditional probability.
We are given:
And, we need to find P(A | B)
According to the formula of conditional probability:
Using the values, we get:
Thus, the probability of occurrence of event A given that event B has already occurred is![\frac{3}{4}](/tpl/images/0122/2685/f11e3.png)