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4 years ago

What is the answered to 400÷2

Mathematics

2 answers:

Katarina [22]4 years ago

8 0

They answer is 200 it's not hard just split 400 in half

Vlad1618 [11]4 years ago

8 0

The answer is 200. Just slip 400 in half.

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Kamila [148]

6 is the correct answer

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3 years ago

Read 2 more answers

Please please please help

Mnenie [13.5K]

Answer: D

Step-by-step explanation: solve it by substitution

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3 years ago

3x - 7 = 7+ 13<br> Answer answer answer help pleas

VMariaS [17]

Answer:

x=9

Step-by-step explanation:

3x-7=7+13

3x-7=20

3x=27

27/3

x=9

8 0

3 years ago

A student invested 70% of her savings in the stock market. If she invested $3,850, what are her total saving

inysia [295]

Answer:

5005

Step-by-step explanation:

70% of saving=$3850

To find the total: 3850*130% because 3850=1=100% and you still need to find the other 30% so you add another 30% which equals to 100%+30%=130%

3850*130%=5005

5 0

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

5 0

4 years ago