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3 years ago

Equivalent fraction of 7/21

Mathematics

2 answers:

AVprozaik [17]3 years ago

7 0

Answer:

1/3

Step-by-step explanation:

Radda [10]3 years ago

3 0

Answer:

1/3

Step-by-step explanation:

7 x 3 = 21

21 / 3 = 7

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fgiga [73]

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Step-by-step explanation:

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3 years ago

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how many weeks of data must be randomly sampled to estimate the mean weekly sales of a new line of athletic footwear? We want 98

Ber [7]

Answer:

We need to sample at least 37 weeks of data.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.98}{2} = 0.01$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.01 = 0.99$ , so $z = 2.327$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

We want 98% confidence that the sample mean is within $500 of the population mean, and the population standard deviation is known to be $1300

This is at least n weeks, in which n is found when $M = 500, \sigma = 1300$

$M = z*\frac{\sigma}{\sqrt{n}}$

$500 = 2.327*\frac{1300}{\sqrt{n}}$

$500\sqrt{n} = 2.327*1300$

$\sqrt{n} = \frac{2.327*1300}{500}$

$(\sqrt{n})^{2} = (\frac{2.327*1300}{500})^{2}$

$n = 36.6$

Rounding up

We need to sample at least 37 weeks of data.

8 0

3 years ago

The volume of a cube whose edge is 3x, is

diamong [38]

Answer:

$27 { x}^{3}$

Step-by-step explanation:

s represents one side of the cube

Volume of cube= (s)^3

= (3x)^3

= 27x^3

6 0

3 years ago

26x=74 which describe how to solve the equation below

Gre4nikov [31]

Answer:

x = 37/13

Step-by-step explanation:

26x=74

x=74/26

x=37/13

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3 years ago

irina [24]

I think b-5 step by step

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3 years ago