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Vika [28.1K]
3 years ago
5

A random sample of 27 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯ = 940 and the

sample standard deviation is s = 15. Use Appendix D to find the values of Student's t.
Mathematics
1 answer:
babunello [35]3 years ago
5 0

Answer:

t value= 99%

Step-by-step explanation:

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Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmospher
Artemon [7]

Answer: 2500 years

Step-by-step explanation:

I'm not quite sure if I'm doing this right myself but I'll give it a shot.

We use this formula to find half-life but we can just plug in the numbers we know to find <em>t</em>.

A(t)=A_{0}(1/2)^t^/^h

We know half-life is 5730 years and that the parchment has retained 74% of its Carbon-14. For A_{0 let's just assume that there are 100 original  atoms of Carbon-14 and for A(t) let's assume there are 74 Carbon-14 atoms AFTER the amount of time has passed. That way, 74% of the C-14 still remains as 74/100 is 74%. Not quite sure how to explain it but I hope you get it. <em>h</em> is the last variable we need to know and it's just the half-life, which has been given to us already, 5730 years, so now we have this.

74=100(1/2)^t^/^5^7^3^0

Now, solve. First, divide by 100.

0.74=(0.5)^t^/^5^7^3^0

Take the log of everything

log(0.74)=\frac{t}{5730} log(0.5)

Divide the entire equation by log (0.5) and multiply the entire equation by 5730 to isolate the <em>t</em> and get

5730\frac{log(0.74)}{log(0.5)} =t

Use your calculator to solve that giant mess for <em>t </em>and you'll get that <em>t</em> is roughly 2489.128182 years. Round that to the nearest hundred years, and you'll find the hopefully correct answer is 2500 years.

Really hope that all the equations that I wrote came out good and that that's right, this is definitely the longest answer I've ever written.

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3 years ago
6. Use the Rational Root (Zero) Theorem to list all the possible real roots (zeros).
maks197457 [2]
The left side
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, which means that the given statement is false.
False
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3 years ago
Evaluate in the following expression when x = 4 and y = 5​
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Fraction with x squared plus y cubed in the numerator and 2 plus x in the denominator.
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What is the exact number of 2000
GaryK [48]
If you are rounding it will be the same thing
5 0
3 years ago
What is the answer to this ?
mezya [45]

Answer:

the missing angle is 5m

Step-by-step explanation:

4 0
3 years ago
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