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2 years ago

Ethan ran 11 miles in 2 hours What is the constent of proporttional of miles to a hour

Mathematics

1 answer:

Dafna1 [17]2 years ago

5 0

Answer:

5.5 miles

Step-by-step explanation:

If he ran 11 miles in 2 hours then divide both of them by 2, so 1 hour is equal to 11 / 2 which is 5.5 miles

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HELP! DUE AT 5 PM!! 10 BRAINLIST!<br><br> 3x -15x - 30 > 54

ryzh [129]

Answer:x<-7

Step-by-step explanation:

3x -15x - 30 > 54

-12x-30>54

-12x<54+30

I moved 30 from left side to right which becomes positive and > becomes <

-12x<84

-12x/-12<84/-12 I used my calculator to do this

x<-7

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3 years ago

Which table represents the statement “A freight train is traveling at an average rate of 45 miles per hour”?

Evgesh-ka [11]

Answer:

the first one

Step-by-step explanation:

the answer is the first one

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3 years ago

If a town with a population of 1,000 doubles in size every 46 years, what will the population be 92 years from now?

Natalija [7]

Answer:

3,000 or 2,000 depends of where it starts at zero or 1,000

Step-by-step explanation:

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3 years ago

Kenny is packing cans into bags at the food bank he cn pack 8 cans into each bag how many bags how many bags will kenny need for

Sholpan [36]

1056cans/ 8 cans=132 bags

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3 years ago

A public health official is planning for the supplyof influenza vaccine needed for the upcoming flu season. She wants to estimat

Marizza181 [45]

Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.04}{1.64})^2}=420.25$

And rounded up we have that n=421

Step-by-step explanation:

We know that the sample proportion have the following distribution:

$\hat p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by:

$z_{\alpha/2}=-1.64, z_{1-\alpha/2}=1.64$

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

And on this case we have that $ME =\pm 0.04$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

We assume that a prior estimation for p would be $\hat p =0.5$ since we don't have any other info provided. And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.04}{1.64})^2}=420.25$

And rounded up we have that n=421

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3 years ago