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Dafna11 [192]
2 years ago
7

Can I have the answer (15 points)​

Mathematics
1 answer:
hodyreva [135]2 years ago
4 0
N=9..................
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What is the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81?
Marizza181 [45]

Answer: d. 1.3333

Step-by-step explanation:

We know that the standard error of a sampling distribution is given by :-

S.E.=\dfrac{\sigma}{\sqrt{n}}

, where \sigma = Population standard deviation.

n= Sample size.

AS per given , we have

\sigma =12

n=81

Then, the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81 will be :-

S.E.=\dfrac{12}{\sqrt{81}}

=\dfrac{12}{\sqrt{9^2}}=\dfrac{12}{9}\\\\=\dfrac{4}{3}\\\\\approx1.3333

Hence, the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81 is 1.3333.

Thus the correct answer is d. 1.3333 .

6 0
3 years ago
Dollar is worth three and 3 1/2 kruneros. What is the value of 43 3/4 kruneros?
Korvikt [17]

<em><u>Question:</u></em>

One dollar is worth 3 1/2 kruneros. What is the value of 43 3/4 kruneros?

<em><u>Answer:</u></em>

The value of 43\frac{3}{4} kruneros is 12.5 dollars

<em><u>Solution:</u></em>

Given that,

Dollar is worth three and 3 1/2 kruneros

Which means,

1 \text{ dollar } = 3\frac{1}{2} \text{ kruneros }\\\\1 \text{ dollar } = 3.5 \text{ kruneros }

We have to find the value of 43\frac{3}{4} kruneros

Let us convert the mixed fractions to improper fractions

Multiply the whole number part by the fraction's denominator.

Add that to the numerator.

Then write the result on top of the denominator.

43\frac{3}{4} = \frac{43 \times 4 + 3}{4} = \frac{175}{4} = 43.75

So we have to find the value of 43.75 kruneros

Let "x" be the value of 43.75 kruneros

Then,

1 dollar = 3.5 kruneros

x dollar = 43.75 kruneros

This forms a proportion and we can solve the sum by cross multiply

1 \times 43.75 = x \times 3.5\\\\x = \frac{43.75}{3.5}\\\\x = 12.5

Thus value of 43\frac{3}{4} kruneros is 12.5 dollars

5 0
2 years ago
Will Mark Brainliest!!! Name the property illustrated.
bulgar [2K]

Answer:

5) distributive property

7) Transitive property

8) Associative property

Step-by-step explanation:

8 0
3 years ago
Solve for the equation 2x+9=3x
Molodets [167]

Answer:

x=9

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Factor k 2 + 8k + 15.<br> answers.<br> (k + 1)(k + 15)<br> (k + 8)(k + 7)<br> (k + 3)(k + 5)
KATRIN_1 [288]
K^2 +3k +5k + 15
k (k+3) +5 (k+3)
(k+5)(k+3)


So, the correct option is the last one.
4 0
3 years ago
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