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3 years ago

Can someone please help me

Mathematics

2 answers:

Vilka [71]3 years ago

8 0

You have to find the unit rate of the average cost per visit
so I think you have to divide 269.50 by 14 which equals 19.25 and I think that is your answer

MAXImum [283]3 years ago

3 0

19.25 because if u add al of that u will get 19.25

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Help pls, write these words in ABC order

viva [34]

Answer:

1. Blouse

2. Caught

3. Coil

4. Crowded

5. Enjoy

6. Frowning

7. Growing

8. Grown

9. Halt

10. Haunted

11. Jigsaw

12. Joyful

13. Launch

14. Lawn

15. Redraw

16. Sourness

17. Strawberry

18. Thoughtful

19. Turquoise

20. Vault

3 0

3 years ago

Of 1000 randomly selected cases of lung cancer, 823 resulted in death within 10 years.

Arada [10]

Answer:

a) $0.823 - 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.799$

$0.823 + 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.847$

The 95% confidence interval would be given by (0.799;0.847)

b) $n=\frac{0.823(1-0.823)}{(\frac{0.03}{1.96})^2}=621.79$

And rounded up we have that n=622

c) $n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

Part a

$\hat p=\frac{823}{1000}=0.823$

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 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The confidence interval for the mean is given by the following formula:

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

If we replace the values obtained we got:

$0.823 - 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.799$

$0.823 + 1.96\sqrt{\frac{0.823(1-0.823)}{1000}}=0.847$

The 95% confidence interval would be given by (0.799;0.847)

Part b

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 $ME =\pm 0.03$ 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)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.823(1-0.823)}{(\frac{0.03}{1.96})^2}=621.79$

And rounded up we have that n=622

Part c

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

5 0

3 years ago

VARIABLE ON BOTH SIDES. PLEASE HELP! 40 PTS<br><br> 2x + 4 = 3 (x-2) + 2 show your work

Angelina_Jolie [31]

2x+4= 3x-6+2

2x+4=3x-4

2x-3x+4=3x-3x-4

-x+4=-4

-x+4-4= -4-4

-x=-8

Need to multiply by -1 for x to be positive and also for -8

-1(-x)= -1(-8)

x=8

5 0

3 years ago

Read 2 more answers

Five more than twice a number is 17

Ierofanga [76]

5+2x=17 is the inequality.

5 0

4 years ago

In a trivia contest, players form teams and work together to earn as many points as possible for their team. Each team can have

N76 [4]

Answer:

There were 2 expressions I thought of it could be 10 x 5 or 10 + 10 + 10 + 10 + 10. I honestly hope this is the right answer because i'm only in 6th grade but hopefully it's correct.

Step-by-step explanation:

4 0

3 years ago