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Delvig [45]
3 years ago
11

Do all regular polygons have point symmetry? Explain.

Mathematics
2 answers:
Goshia [24]3 years ago
8 0

Answer:

Nope.

Hey mate, here is your answer. Hope it helps you.

Step-by-step explanation:

No,not all polygons have symmetry. Only regular polygons who have same number of sides have point symmetry. Point Symmetry is when every part has a matching part the same distance from the central point but in the opposite direction.

lubasha [3.4K]3 years ago
4 0

The answer is<em> D) No, because all regular polygons do not have rotational symmetry of 180°</em> on Edge 2020

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What is the number written in standard notation?
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Answer:

option B

Step-by-step explanation:

To find the number which is written in the standard form,5 \times {10}^{3}

We expand {10}^{3} and multiply by 5 to get

= 5 \times (10 \times 10 \times 10)

=5\times 1000

=5000

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3 years ago
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Would 45% of 160 be greater than or less than 80?
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45% is less than 80. The actual answer is 72. Hope that helps :)
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A building in the shape of a pyramid was recently built. Each side of the pyramid’s square base has a length of 40 feet and the
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3 years ago
Construct a​ 99% confidence interval for the population​ mean, mu. Assume the population has a normal distribution. A group of 1
Zarrin [17]

Answer:

99% confidence interval for the population​ mean is [19.891 , 24.909].

Step-by-step explanation:

We are given that a group of 19 randomly selected students has a mean age of 22.4 years with a standard deviation of 3.8 years.

Assuming the population has a normal distribution.

Firstly, the pivotal quantity for 99% confidence interval for the population​ mean is given by;

         P.Q. = \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

where, \bar X = sample mean age of selected students = 22.4 years

             s = sample standard deviation = 3.8 years

             n = sample of students = 19

             \mu = population mean

<em>Here for constructing 99% confidence interval we have used t statistics because we don't know about population standard deviation.</em>

So, 99% confidence interval for the population​ mean, \mu is ;

P(-2.878 < t_1_8 < 2.878) = 0.99  {As the critical value of t at 18 degree of

                                                freedom are -2.878 & 2.878 with P = 0.5%}

P(-2.878 < \frac{\bar X - \mu}{\frac{s}{\sqrt{n} } } < 2.878) = 0.99

P( -2.878 \times {\frac{s}{\sqrt{n} } } < {\bar X - \mu} < 2.878 \times {\frac{s}{\sqrt{n} } } ) = 0.99

P( \bar X -2.878 \times {\frac{s}{\sqrt{n} } < \mu < \bar X +2.878 \times {\frac{s}{\sqrt{n} } ) = 0.99

<u>99% confidence interval for</u> \mu = [ \bar X -2.878 \times {\frac{s}{\sqrt{n} } , \bar X +2.878 \times {\frac{s}{\sqrt{n} } ]

                                                 = [ 22.4 -2.878 \times {\frac{3.8}{\sqrt{19} } , 22.4 +2.878 \times {\frac{3.8}{\sqrt{19} } ]

                                                 = [19.891 , 24.909]

Therefore, 99% confidence interval for the population​ mean is [19.891 , 24.909].

6 0
3 years ago
A bag has 4 green marbles, 3 red marbles, and 3 yellow marbles. What is the probability that you pick
STALIN [3.7K]

|\Omega|=10\cdot9=90\\ |A|=3\cdot3=9\\\\ P(A)=\dfrac{9}{90}=\dfrac{1}{10}=10\%

6 0
3 years ago
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