2 years ago

Anyone?? Tbh I’m actually having trouble with this question.

Mathematics

1 answer:

aksik [14]2 years ago

5 0

You would do 66×3, which is 198

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Find the sample size required to achieve the given margin of error with SD = 51.02 and z - score = 1.96. Round your answer to th

coldgirl [10]

Answer:

The sample size required is 2500.

Step-by-step explanation:

z-score:

In function of the margin of error M, the z-score is given by:

$Z = \frac{M}{\frac{\sigma}{\sqrt{n}}} = \frac{M\sqrt{n}}{\sigma}$

In this question, we have that:

$\sigma = 51.02, M = 2, Z = 1.96$

$Z = \frac{M\sqrt{n}}{\sigma}$

$1.96 = \frac{2\sqrt{n}}{51.02}$

$2\sqrt{n} = 51.02*1.96$

$\sqrt{n} = \frac{51.02*1.96}{2}$

$(\sqrt{n})^2 = (\frac{51.02*1.96}{2})^2$

$n = 2500$

The sample size required is 2500.

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2 years ago

Ordered pair for 3x + 5y = 2 <br><br> 9x + 11y = 14

Brums [2.3K]

Answer:

Step-by-step explanation:

-9x - 15y = -6

9x + 11y = 14

-4y = 8

y = -2

3x - 10 = 2

3x = 12

x = 4

(4, -2)

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2 years ago

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If sin (90° - α) = BC /CA,write down the ratio of sina.

Papessa [141]

Answer:

Step-by-step explanation:

sin(90-a)=cos

cos = angle adjacent

theta=BC/CA

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1 year ago

A stack of 30 science flashcards includes a review card for each of the following: 10 insects, 8 trees, 8 flowers, and 4 birds.

coldgirl [10]

All you have to do is make the fraction of it which is 4/30. Then simplify to 2/15 which is your answer.

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Find the distance from the point to the given plane. (−8, 6, 4), x − 2y − 4z = 8

Nikitich [7]

Lol just get a calculator and math paper. This is not cool, u aren't in college. Im in 7TH GRADE and I can do this garbage...

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2 years ago