The two-way table below gives information on seniors and juniors at a high school and by which means they typically get to schoo
l.
you select one student from this group at random. If the student says he is a senior, what is the probability that he or she takes the bus to school.
A) 0.073
B) 0.160
C) 0.256
D) 0.455
you select one student from this group at random. If the student says he is a senior, what is the probability that he or she takes the bus to school.
A) 0.073
B) 0.160
C) 0.256
D) 0.455
1 answer:
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Answer:
We can use the sample about 42 days.
Step-by-step explanation:
Decay Equation:
Integrating both sides
When t=0, N= = initial amount
.......(1)
.........(2)
Logarithm:
130 days is the half-life of the given radioactive element.
For half life,
,
days.
we plug all values in equation (1)
We need to find the time when the sample remains 80% of its original.
We can use the sample about 42 days.