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3 years ago

Suppose a radioactive substance has a half-life of 1000 years. What fraction will be left after 1000 years?

Mathematics

2 answers:

Nezavi [6.7K]3 years ago

5 0

Answer:

1/2

Step-by-step explanation:

so if u do the waffalineneh times by arcimate it would equivently be the answer on top

salantis [7]3 years ago

3 0

Answer:

$\frac{1}{2}$

Step-by-step explanation:

The half life is the amount of time it takes a substance to decay to half of its original amount.

Since the radioactive substance has a half life of 1000 years, there will be half of it left after 1000 years.

So, the fraction that will be left after 1000 years is $\frac{1}{2}$

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A researcher wishes to estimate, with 9090% confidence, the proportion of adults who have high-speed Internet access. Her es

Sunny_sXe [5.5K]

Answer: a) Required minimum sample size= 219

b) Required minimum sample size= 271

Step-by-step explanation:

As per given , we have

Margin of error : E= 5% =0.05

Critical z-value for 90% confidence interval : $z_{\alpha/2}=1.645$

a) Prior estimate of true proportion: p=28%=0.28

Formula to find the sample size :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.28(1-0.28)(\dfrac{1.645}{0.05})^2\\\\=218.213856\approx219$

Required minimum sample size= 219

b) If no estimate of true proportion is given , then we assume p= 0.5

Formula to find the sample size :-

$n=0.5(1-0.5)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.25(\dfrac{1.645}{0.05})^2\\\\=270.6025\approx271$

Required minimum sample size= 271

8 0

2 years ago

What is the answer I need this to be right (n)=3.5 that’s all it gave me HELP

masha68 [24]

Answer:

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Step-by-step explanation:

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2 years ago

What kind of triangle is this?

Agata [3.3K]

B. As all the sides are different lengths and angle f is bigger than 90 so it is obtuse
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3 years ago

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omeli [17]

Answer:

Step-by-step explanation: 180 is the full amount of angles in a triangle

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3 years ago

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dexar [7]

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