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Marianna [84]
2 years ago
5

I need Help...........

Mathematics
1 answer:
uranmaximum [27]2 years ago
6 0
The link up there works no cap
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Which equation has no solition
DochEvi [55]
Every equation does?
6 0
3 years ago
Read 2 more answers
Dentify as an increase or decrease. Then find the percent of increase or decrease. If necessary, round to the nearest percent.
love history [14]

Answer:

Step-by-step explanation:

The difference is 130-150 = -20, a decrease.

-20/150 ≅ -0.133, a decrease of 13.3%

4 0
2 years ago
The Information Technology Department at a large university wishes to estimate the proportion of students living in the dormitor
nadya68 [22]

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

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".  

Solution to the problem

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 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.005. And the critical value would be given by:

z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58

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 0.05 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 can use as an estimator for p \hat p =0.5. And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

3 0
3 years ago
Solve: a/3= 5<br><br> what is a?
svp [43]

Answer:

a = 15

Step-by-step explanation:

This is your given:

       \frac{a}{3} = 5

You are going to want to get a alone to get what a equals.

\frac{a}{3} = 5

a = 5x3  Multiply 3 on both sides to get the a alone

a = 15

7 0
3 years ago
Read 2 more answers
A pension fund owns 11,000 shares in a stock mutual fund and a bond mutual fund. Currently the stock fund sells for $12 per shar
Olenka [21]

9514 1404 393

Answer:

  • 5000 shares of stock fund
  • 6000 shares of bond fund

Step-by-step explanation:

Let b represent the number of shares of the bond fund owned. Then the value of the pension fund is ...

  15b +12(11000-b) = 150000

  3b = 18000 . . . . . . . . . . subtract 130,000

  b = 6000 . . . . . . . . . shares of bond fund

  11000 -b = 5000 . . . shares of stock fund

7 0
3 years ago
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