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VARVARA [1.3K]
2 years ago
13

If 6.2a=0.0143 then what is a?​

Mathematics
1 answer:
Evgesh-ka [11]2 years ago
3 0

6.2a = 0.0143

=> a = 0.0143/6.2

=> a = 0.0023......

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2 years ago
The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population o
blondinia [14]

The value of mean, standard deviation and interval from the method of tree ring dating is 1273 AD, 37 years, [1250,1296].

According to the statement

we have to find that the standard deviation, mean and the intervals from the given data.

So, According to the given data from the method of tree ring dating

The value of mean is

x-bar = (1271 + 1208 + 1229 + 1299 + 1268 + 1316 + 1275 + 1317 + 1275) / 9 = x-bar = 1273 AD

And now we find standard deviation :

s = √∑(xi - x-bar) / (N - 1)

∑(xi - x-bar)^2 = (1271 - 1273)2 + (1208 - 1273)2 + (1229 - 1273)2 + ... + (1275 - 1273)2

∑(xi - x-bar)^2 = (-2)2 + (-65)2 + (-44)2 + ... + (2)2

∑(xi - x-bar)^2 = 4 + 4225 + 1936 + 676 + 25 + 1849 + 4 1936 + 4

∑(xi - x-bar)^2 = 10,659

Now,

s^2 = 10659/8 = 1332

s = 37 years

So, standard deviation is 37 years.

We need the t-distribution table since the standard deviation is unknown.  Therefore, our degrees of freedom is 9 - 1 = 8 and the critical value is 1.860.  Set up the confidence interval for the mean:

[x-bar ± t*(s/√n)] = [1273 ± 1.860*(37/√9)]

[x-bar ± t*(s/√n)] = [1250,1296]

So, The value of mean, standard deviation and interval from the method of tree ring dating is 1273 AD, 37 years, [1250,1296].

Learn more about method of tree ring dating here

brainly.com/question/15107034

Disclaimer: This question was incomplete. Please find the full content below.

Question:

The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution.

For more data please see the image below.

#SPJ4

4 0
1 year ago
What is the slope of the line that passes through points (6, 7) and (4, 2)?
Maslowich

The slope is 2.5!

y=2.5x-8

Hope this helps!

8 0
3 years ago
What is the total area of this composite figure rounded to the nearest hundredth?
weqwewe [10]

Answer:

choice #4, total=31.14 mm^2

Step-by-step explanation:

14x2=28 is area of rectangle

1^2xPi=area of small circle

3.14=area of small circle

total=31.14 mm^2

7 0
3 years ago
F(x) = 2(x+1)3 even or odd
Andrews [41]

Answer:

Neither even  nor odd.

Step-by-step explanation:

f(x) =  2(x + 1)^3 = 2x^3 + 18x^2 + 54x + 54

f(-x) =  -2x^3 + 18x^2 - 54x + 54

If it was even f(x) would be = f(-x)   so it is NOT EVEN.

-f(x) =  2x^3 - 18x^2 + 54x - 54

So f(-x) is not = -f(x) so it is not ODD either.

7 0
3 years ago
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