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3 years ago

What is the following sum ?

Mathematics

2 answers:

Hitman42 [59]3 years ago

6 0

Answer: 4th option

Explanation:

I added a picture so please check it

ale4655 [162]3 years ago

4 0

Following the sun duahahaha ahaha here comes the sun bahaha

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ou are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on cons

PolarNik [594]

Answer:

$(\frac{4\sigma}{2.056})^2$ , rounded up, if needed, citizens should be included in the sample, in which $\sigma$ is the standard deviation of the population.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.96}{2} = 0.02$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.02 = 0.98$ , so Z = 2.056.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Within 4 years of the actual mean

We have to find n for which M = 4. So

$M = z\frac{\sigma}{\sqrt{n}}$

$4 = 2.056\frac{\sigma}{\sqrt{n}}$

$2.056\sqrt{n} = 4\sigma$

$\sqrt{n} = \frac{4\sigma}{2.056}$

$(\sqrt{n})^2 = (\frac{4\sigma}{2.056})^2$

$n = (\frac{4\sigma}{2.056})^2$

$(\frac{4\sigma}{2.056})^2$ , rounded up, if needed, citizens should be included in the sample, in which $\sigma$ is the standard deviation of the population.

8 0

3 years ago

If the area of the triangle (the shaded portion below) within the pentadecagon is 10 units, what is the area

GaryK [48]

Answer:

150

Step-by-step explanation:

8 0

4 years ago

Meena's family took a road trip to Niagara Falls. Meena slept through the last 49% of the trip. If the total length of the trip

Daniel [21]

<u>Answer:</u> (update)

<h2>122.5 miles</h2>

<u>Explanation:</u>

given: the total length of the trip = 500 miles

hence the road's length from home to niagara falls = 500/2 = 250

Sleepy Meena missed:

250/100×49 = 2.5×49 = 122.5 miles

7 0

3 years ago

The radius of a circle is measured at 15.6cm. The actual radius is 15.3cm. Find, to the nearest percent, the percent error in th

Anon25 [30]

Answer:

$Percentage\hspace{3}error\approx 1.96\%$

Step-by-step explanation:

The error percentage is a measure of how inaccurate a measurement is, standardized based on the size of the measurement. It can be easily calculated using the following formula:

$Percentage\hspace{3}error=|\frac{v_A-v_E}{v_E} | \times 100$