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Simora [160]
3 years ago
11

Let ​f(x)=x2−4 and ​g(x)=7−x. Perform the composition or operation indicated. ​(fg)(8​)

Mathematics
1 answer:
Dominik [7]3 years ago
3 0

Answer:

(f\circ g)(8)=-3

Step-by-step explanation:

<u>Composite Function</u>

Given f(x) and g(x) real functions, the composite function named (f\circ g)(x) is defined as:

(f\circ g)(x)=f(g(x))

For practical purposes, it can be found by substituting g into f.

The functions are defined as follows:

f(x)=x^2-4

g(x)=7-x

To find (f\circ g)(8), we evaluate g in x=8 and then apply the composition formula.

g(8)=7-8=-1

(f\circ g)(8)=f(g(8))

(f\circ g)(8)=f(-1)

(f\circ g)(8)=(-1)^2-4=1-4

\boxed{(f\circ g)(8)=-3}

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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

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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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