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scoray [572]
2 years ago
8

How to calculate sample size with standard deviation

Mathematics
1 answer:
VLD [36.1K]2 years ago
8 0

Answer:

Step 1: Calculate the mean of the data—this is \muμmu in the formula.

Step 2: Subtract the mean from each data point. These differences are called deviations. Data points below the mean will have negative deviations, and data points above the mean will have positive deviations.

Step 3: Square each deviation to make it positive.

Step 4: Add the squared deviations together.

Step 5: Divide the sum by the number of data points in the population. The result is called the variance.

Step 6: Take the square root of the variance to get the standard deviation

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The residents of a city voted on whether to raise property taxes. The ratio of yes votes to no votes was 6 to 5. If there were 4
Alex73 [517]

Answer:

5226

Step-by-step explanation:

We can write the following ratios

Yes:no

6:5

x:4355

To solve this we have to mulitply 6 by 871 (because this is what we mulitplied  the original ratio by to get 4355) 6*871=5226

5 0
3 years ago
Which expression is equal to 2sin(pi/10)cos(pi/10)? <br><br> please help asap! thank you!
erastovalidia [21]

Answer: sin pi/5, or answer C

Step-by-step explanation:

I got it right on the quiz!

6 0
3 years ago
Read 2 more answers
Packaging By cutting away identical squares from each corner of a rectangular piece of cardboard and folding up the resulting fl
Kobotan [32]

Answer:

The dimension of the box is 18.66 in by 2.66 in by 1.17 in.

Step-by-step explanation:

Given that, The cardboard is 21 in. long and 5 in. wide.

Assume,x be the length of the each sides of the square .

Then the length of the box is = (21-2x) in.

The breadth of the box is =(5-2x) in.

The height of the box is  = length of side of the square

                                         = x in.

The volume of the box = length × wide × height

                                      =(21-2x)(5-2x)x

                                      =(105-52x+4x²)x

                                      =(105 x-52x^2+4x^3)

Let

V=105 x-52x^2+4x^3

Differentiating with respect to x

V'=105-104x+12x^2

Again differentiating with respect to x

V''=-104+24x

To find the dimension of the box, we set V'=0

105-104x+12x^2=0

Applying the quadratic formula x=\frac{-b\pm \sqrt{b^2-4ac}}{2a} , here a=12, b= -104 and c =105

\Rightarrow x=\frac{-(-104)\pm\sqrt{(-104)^2-4.12.105}}{2.12}

      =\frac{104\pm 76}{24}

      =7.5, 1.17

For x= 7.5 , the wide of the box will be negative.

∴x=1.17 in.

V''_{x=1.17}=-104+(24\times 1.17)

Since at x= 1.17, V''<0 , therefore at x=1.17 in. the volume of the given box will be maximum.

The length of the box is = [21-(1.17×2)]=18.66 in.

The wide of the box is = [5-(1.17×2)]=2.66 in.

The height of the box is = 1.17 in.

The dimension of the box is 18.66 in by 2.66 in by 1.17 in.

5 0
4 years ago
I need help plzzzzzzzzzzzzzz
Alchen [17]
A is the answer to your question
5 0
3 years ago
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3 3/8 divided by 2 1/4 =
denpristay [2]

Answer:

1.5 or 1/5

Step-by-step explanation:

Dividing two fractions is the same as multiplying the first fraction by the reciprocal of the second fraction. The first step to dividing fractions is to find the reciprocal (reverse the numerator and denominator) of the second fraction. Next, multiply the two numerators. Then, multiply the two denominators.

6 0
3 years ago
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