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3 years ago

How many skimboards and longboards must the shop sell each week to make a profit

Mathematics

2 answers:

s344n2d4d5 [400]3 years ago

4 0

10 I think. Please don’t kill me if I’m wrong

jeka57 [31]3 years ago

3 0

Answer:

Step-by-step explanation:

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Katherine's class is selling raffle tickets for $3 to raise money for charity. Katherine's class raised $504. Which equation wou

maw [93]

Answer:

3T=504

Step-by-step explanation:

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3 years ago

The figure shows a person estimating the height of a tree by looking at the top of the tree with a mirror. Assuming that both th

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6 over h equals 3 over 7. It’s answer B

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3 years ago

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15y+5y-19y+2=4 what is y

Mumz [18]

Answer:

y=2

Step-by-step explanation:

15y+5y-19y+2=4

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2 years ago

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Which is the definition of a ray?

valkas [14]

Answer:

Ray. Definition: A portion of a line which starts at a point and goes off in a particular direction to infinity. Try this Adjust the ray below by dragging an orange dot and see how the ray AB behaves. Point A is the ray's endpoint. -Google

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3 years ago

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The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident th

Aleks04 [339]

Answer:

The minimum sample size that can be taken is of 14 dogs.

Step-by-step explanation:

The formula for calculating the minimum sample size to estimate a population mean is given by:

$n=\frac{z^{2}\sigma^{2}}{e^{2}}$

The <u>first step</u> is obtaining the values we're going to use to replace in the formula.

Since we want to be 95% confident, $1-\alpha=0.95 \Rightarrow \alpha=0.05$ .

Therefore we look for the critical value $z_{\alpha/2}=1.96$ .

Then we calculate the variance:

$\sigma = 3.7 \Rightarrow \sigma^{2}=13.69$

And we have that:

$e=2 \Rightarrow e^{2}=4$

<u>Now</u> we replace in the formula with the values we've just obtained:

$n=\frac{1.96^{2}*13.69}{4}=13.1479\approx 14$

Therefore the minimum sample size that can be taken to guarantee that the sample mean is within 2 inches of the population mean is of 14 dogs.

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3 years ago