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3 years ago

How many groups of 3 can go in to 57

Mathematics

1 answer:

Bad White [126]3 years ago

4 0

Answer:

Step-by-step explanation:

If you divide 57 by 3, the answer you will get is 19. Hope this helped!

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If X = {−1, 0, 2} and Y = {1, 2, 5}, find X ∪ Y.

Irina18 [472]

yo sup??

as mentioned earlier XUY is simply the summation of all the unique elements of X and Y

S=XUY

={-1,0,1,2,5}

Therefore your answer is option 1 ie

1.{-1,0,1,2,5}

Hope this helps.

5 0

3 years ago

Read 2 more answers

A news agency publishes results of a recent poll. It reports that candidate A leads candidate B by 10% because 45% of the poll p

natali 33 [55]

We need to use the formula to find Margin of Error but through the sample proportion, that is

$E=z*\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$

We will use a 95% confidence interval, that is a z value of 1.96 (Search in a Normal distribution table)

A) For A our $\hat{p}$ (proportion) is equal to 0.45. So applying the formula,

$E=1.96*\sqrt{\frac{0.45(1-0.45)}{900}}$

$E=3.25\%$

B) We make the same of point A, but change our proportion to 0.35

$E=1.96*\sqrt{\frac{0.35(1-0.35)}{900}}$

$E=3.116\%$

c) We need to calculate the SE through proportion for 0.1, that is

$SE = \sqrt{(\frac{\hat{p_1}(1-\hat{p_1})}{n})+(\frac{\hat{p_2}(1-\hat{p_2})}{n})}$

Then our Error is given by,

$E=z*SE$

$E=1.96*\sqrt(0.45*\frac{0.55}{900}+0.35\frac{0.65}{900}$

$E=0.045$

7 0

3 years ago

The mean height of a Clydesdale horse is 72 inches with a standard deviation of 1.2 inches. What is the probability that a Clyde

Lubov Fominskaja [6]

Answer:

0.0062

Step-by-step explanation:

Given that:

Mean (μ) = 72 inches, Standard deviation (σ) = 1.2 inches.

The z score is a measure in statistics is used to determine by how many standard deviation the raw score is above or below the mean. If the raw score is above the mean, the z score is positive and if the raw score is below the mean, the z score is negative.

The z score is given as:

$z=\frac{x-\mu}{\sigma}$

For Clydesdale is greater than 75 inches tall, x = 75 inches, the z score is:

$z=\frac{x-\mu}{\sigma}=\frac{75-72}{1.2} =2.5$

The probability that a Clydesdale is greater than 75 inches tall = P(X > 75) = P(Z > 2.5) = 1 - P(Z < 2.5) = 1 - 0.9938 = 0.0062 = 0.62%

The probability that a Clydesdale is greater than 75 inches tall is 0.62%

3 0

3 years ago

The figure shows a circle inscribed in a triangle. To construct the inscribed circle, angle bisectors were first constructed at

klemol [59]

Answer:

Segments perpendicular to the sides of the triangle through the intersection of the angle bisectors were constructed.

Step-by-step explanation:

The above choice represents a bit of excess work. Actually, only one such perpendicular line segment needs to be constructed in order to determine the radius of the inscribed circle.

Once you know the center and radius, you can construct the inscribed circle.

7 0

3 years ago

Read 2 more answers

Si a un múltiplo de 8 le sumo 1 obtengo un múltiplo de 5, ¿qué múltiplos de 8

Simora [160]

Answer:

24, 64

Step-by-step explanation:

If I add 1 to a multiple of 8 I get a multiple of 5, what multiples of 8

meet the condition? (Mention at least 2 of them)

3 x 8 + 1 = 25

8 x 8 + 1 = 65

4 0

3 years ago