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|3 - 5 + 7|.<br><br>O 15<br>O 5<br>O -15<br>O -5

Aliun [14]

Answer:

5

Step-by-step explanation:

The answer is 5

because 3 - 5 = -2

and -2 + 7 = 5

so the answer is 5

4 0

3 years ago

joey's mom baked two dozen cookies . that night, there were only 14 cookies left. what percentage of the cookies were eaten?

Aleksandr [31]

Answer:

41.67 % ( to 2 dec. places )

Step-by-step explanation:

Since 2 dozen cookies were baked, that is 24 and 14 were left.

Then 10 were eaten.

Calculate the percentage eaten as

percentage = $\frac{numbereaten}{original}$ × 100%

percentage eaten = $\frac{10}{24}$ × 100% ≈41.67%

5 0

3 years ago

A random sample of 200 shoppers at a local grocery store found that 135 of the 200 sampled

VMariaS [17]

Using the z-distribution, as we are working with a proportion, it is found that samples of 937 should be taken.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which:

$\pi$ is the sample proportion.

z is the critical value.

n is the sample size.

The margin of error is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In this problem, we have that:

The estimate is of $\pi = 0.675$ .

The margin of error is of M = 0.03.

95% confidence level, hence $\alpha = 0.95$ , z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so $z = 1.96$ .

Then, we solve for n to find the minimum sample size.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.675(0.325)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.675(0.325)}$

$\sqrt{n} = \frac{1.96\sqrt{0.675(0.325)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.96\sqrt{0.675(0.325)}}{0.03}\right)^2$

$n = 936.4$

Rounding up, it is found that samples of 937 should be taken.

More can be learned about the z-distribution at brainly.com/question/25890103

4 0

2 years ago

En la siguiente sucesión numérica 8,7,11,10,14 los dos números siguientes son

Oxana [17]

<h3>Numerical sequences</h3>

To find the missing numbers in the sequence, we must identify the rule by which they change.

The <u>sequence starts at 8 and then decreases by 1,</u> therefore, the second term is 7. The third term increases by 4 units with respect to the second, going from 7 to 11, and the fourth decreases again by 1, now remaining at 10.

The fifth term increases again by 4 units, from 10 to 14. This already gives us a clear idea of the rule that the sequence follows.

<h3>Decrease 1, increase 4, decrease 1, increase 4,…</h3>

₊₄ ₊₄

⁻¹ ⁻¹ ⁻¹

<em>In this way, the sixth </em><em>element must decrease by 1</em><em>, that is 13 and the seventh must increase </em><em>by 4, that is 17</em><em>.</em>

8, 7, 11, 10, 14, 13, 17,…

The next numbers that the numerical sequence are 13 and 17, to complete. ✅

6 0

2 years ago

. How many 4ʹ × 8ʹ sheets of plywood are required to cover a floor that is 9 m by 16 m?

Black_prince [1.1K]

[m(100cm/m)(in/2.54cm)(ft/12)]^2=(25/7.62)^2 ft^2

(9*16)m^2(25ft^2/7.62m^2)(sheets/(4*8)ft^2)≈48.44 sheets

In reality you must buy complete sheets, or integer values, so you would need 49 sheets to cover the floor :P

4 0

3 years ago

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