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3 years ago

A customer pays $18 for DVD that originally cost $20. What is the percent decrease in the cost of the dvd.

Mathematics

1 answer:

Feliz [49]3 years ago

8 0

Answer:

Step-by-step explanation:

18-20=2 so thats your answer

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You have been assigned to determine whether more people prefer Coke or Pepsi. Assume that roughly half the population prefers Co

Alex Ar [27]

Answer:

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

And rounded up we have that n=1068

Step-by-step explanation:

For this case we have the following info given:

$ME=0.03$ the margin of error desired

$Conf= 0.95$ the level of confidence given

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)

the critical value for 95% of confidence is $z=1.96$

We can use as estimator for the population of interest $\hat p=0.5$ . 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:

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

And rounded up we have that n=1068

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3 years ago

HAVE A FREE 100 POINTS! PASS ON THE FUN AND KINDNESS SOMEDAY!

fredd [130]

Answer:

Ty :)

Step-by-step explanation:

I lost all my points bc a moderator (LukeG1) >:(

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Ayudaaaaaaaaaaaaaaaaaaaa

maksim [4K]

Lo siento, no hablo español

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kolbaska11 [484]

You need to take pictures of the graph for us to answer.

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The difference between the MDC and the LDC's

Contact [7]

Answer: MDCs have advanced socially and economically, whereas LDCs are in the early stages of development.

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