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3 years ago

Hellllllllllllllllllllllllllp me plzzzzz

Mathematics

1 answer:

anzhelika [568]3 years ago

4 0

D. 7 miles

Step-by-step explanation:

26.5/4 =6.62

So the best estimate is 7 miles

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An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 1.6

nexus9112 [7]

Answer:

n=1705

Step-by-step explanation:

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Assuming the X follows a normal distribution

$X \sim N(\mu, \sigma=1.6)$

And the distribution for $\bar X$ is:

$\bar X \sim N(\mu, \frac{1.6}{\sqrt{n}})$

We know that the margin of error for a confidence interval is given by:

$Me=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

The next step would be find the value of $\z_{\alpha/2}$ , $\alpha=1-0.99=0.01$ and $\alpha/2=0.005$

Using the normal standard table, excel or a calculator we see that:

$z_{\alpha/2}=\pm 2.58$

If we solve for n from formula (1) we got:

$\sqrt{n}=\frac{z_{\alpha/2} \sigma}{Me}$

$n=(\frac{z_{\alpha/2} \sigma}{Me})^2$

And we have everything to replace into the formula:

$n=(\frac{2.58(1.6)}{0.1})^2 =1704.03$

And if we round up the answer we see that the value of n to ensure the margin of error required $\pm=0.1$ mm is n=1705.

6 0

2 years ago

One drumming pattern originating in Ghana can be played at 2.5 beats per second. To find the number of beats played in s seconds

Vikentia [17]

12 beats are played in 30 seconds

You would have to divide

30 / 2.5 = 12 beats

:)

8 0

3 years ago

What percent of 18.75 is 27?

Olin [163]

The answer is 144%

Your welcome

4 0

3 years ago

A toddler is 36 inches tall and grows about 3 inches per year. Which of the following functions represents the toddler's height,

8_murik_8 [283]

Answer

I think the answer could be B

8 0

2 years ago

Read 2 more answers

Write a function rule that gives the total cost c(p) of pounds of sugar if each pound cost $.59

aliina [53]

Answer: c(p) = 0.59*p

All we do is multiply the price per pound (0.59) by the number of pounds (p). In this case, we don't know how many pounds there are. So we leave p as is. If for instance, we had 10 pounds, then we'd replace p with 10. The variable is simply a placeholder for the unknown number.

4 0

2 years ago