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Mariulka [41]
2 years ago
10

Find the slope with (7, 4) and (8, 2)

Mathematics
2 answers:
Dennis_Churaev [7]2 years ago
8 0

Answer:

-2 over 1 or -2

The formula is y= y2-y1 over x2-x1

7= x1

4=y1

8=x2

2=y2

2-4 over 8-7

2-4=-2

8-7=1

The answer would be -2 over 1 or -2

Hope this helped a lot!!!

8_murik_8 [283]2 years ago
4 0

Answer:

-2

Step-by-step explanation:

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A sample with a mean of m = 40 and a variance of s2 = 20 has an estimated standard error of 1 point. how many scores are in the
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The correct option is 20.

The score found for the sample is 20.

<h3>What is Standard error?</h3>

A standard error is a statistic that is applied to test the distribution of data. This metric is comparable to standard deviation. We can calculate the standard error if we know the sample size & standard deviation. It assesses the mean's precision.

Now, according to the question;

Sample mean; \bar{x}=40

Sample variance; s^{2}=20

Thus, s=\sqrt{20}=4.47

Standard error SE = 1

The amount of scores with in sample must be determined here.

The standard error formula is as follows:

S E=\frac{s}{\sqrt{n}}

We might rearrange the formula as follows:

\begin{aligned}\sqrt{n} &=\frac{s}{S E} \\n &=\left(\frac{s}{S E}\right)^{2}\end{aligned}

Substituting the values;

\begin{aligned}&n=\left(\frac{4.47}{1}\right)^{2} \\&n=19.98\end{aligned}

The sample's number of scores n = 19.98 = 20 (round up)

Therefore, the scores are in the sample is 20.

To know more about the Standard error, here

brainly.com/question/14467769

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