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3 years ago

What does rotation summery means in your own words?

1 answer:

4 0

Rotational symmetry is when an object looks the same when rotated around its center by an angle not equal to 0° (0) or any multiple of 360° (2π).

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In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6. Assume the popu

olya-2409 [2.1K]

Answer:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

Step-by-step explanation:

Information given

$\bar X= 19.6$ represent the sample mean

$\mu$ population mean

$\sigma= 5.8$ represent the population deviation

n=42 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom, given by:

$df=n-1=42-1=41$

Since the Confidence is 0.98 or 98%, the significance would be $\alpha=0.02$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=2.42$

Replacing we got:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

8 0

3 years ago

Help!<br><br> What is the log of 10^-4.5?

Anarel [89]

The answer would be approximately 1.98

8 0

2 years ago

Read 2 more answers

What is 1/4 X 5/16 equal

VashaNatasha [74]

$\frac{1}{4}$ x $\frac{5}{16}$

1 x 5 = 5
16 x 4 = 64

$\frac{5}{64}$ is the answer

In simplest form the answer would be $\frac{5}{64}$ because it cant be divided any farther.

6 0

3 years ago

Read 2 more answers

Find g<br>Write your answer in simplest radical form

a_sh-v [17]

Answer:

g = 7 yards

Step-by-step explanation:

you have 7 $\sqrt{3}$ yards for the angle adjacent 30 deg.

tan 60 = $\sqrt{3}$

tan 60 = 7 $\sqrt{3}$ / g

7 * root(3) / g = root(3)

7/g = 1

g = 7 yards

3 0

3 years ago

Add 1 1/3 + (−5/6) = ?

Aleks [24]

1 1/3 = 4/3 (because (3 * 1 + 1) / 3)

We need both parts of sum to have common denominator.
Second part have denominator = 6.
When we multiply nominator and denominator of first part by 2 we get 8/6 (what is legit operation on fractions)

Now easily add:
8/6 + (- 5/6) = 8/6 - 5/6 = 3/6 (here we can divide both nominator and denominator by 3 to get "nicer" result) = 1/2

4 0

2 years ago