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s344n2d4d5 [400]
3 years ago
7

What is the answer to this???

Mathematics
1 answer:
Usimov [2.4K]3 years ago
7 0

Answer:

18

Step-by-step explanation:

First, we have to find out the scale factor of the triangles. So, we go from 20 to 30 by:

20s=30\\s=3/2\\s=1.5

1.5 is the scale factor. We're looking for x. We go from 12 to x by:

12*1.5=x\\18=x

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Calculate the value of the sample variance. Round your answer to one decimal place. 9_5,9_5,2,9_5
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Answer:

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Step-by-step explanation:

Given

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Required

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Sample variance is calculated using:

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First, we calculate the mean

\overline x = \frac{\sum x}{n}

\overline x = \frac{9/5 + 9/5 + 2 + 9/5}{4}

\overline x = \frac{7.4}{4}

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s^2 = \frac{\sum (x_i - \overline x)^2}{n - 1} becomes

s^2 = \frac{(9/5 - 1.85)^2+(9/5 - 1.85)^2+(2 - 1.85)^2+(9/5 - 1.85)^2}{4 - 1}

s^2 = \frac{(-0.05)^2+(-0.05)^2+(0.15)^2+(-0.05)^2}{4 - 1}

s^2 = \frac{0.0025+0.0025+0.0225+0.0025}{3}

s^2 = \frac{0.03}{3}

s^2 = 0.01

<em>Hence, the variance is 0.01</em>

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