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4 years ago

I need help with this!

Mathematics

1 answer:

ruslelena [56]4 years ago

7 0

|12| ÷ 2 • |-5|
= 12 ÷ 2 • 5
= 6 • 5
= 30
Absolute values just make the number positive if it is negative. The number stays positive if it’s positive.

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Use distributive property<br> 10(11 + 4p)

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Step-by-step explanation:

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Find the volume of a tennis ball with diameter of 6.7 centimeters. Round your answer to the nearest hundredth.

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The following observations are given for two variables. x y 2 7 6 10 9 13 11 18 11 21 12 25 7 12 4 7 a. Compute the sample cov

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The given data is:

x = (2, 7, 6, 10, 9, 13, 11, 18)

y = (11, 21, 12, 25, 7, 12, 4, 7)

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$S_{XY}=\frac{\sum_{i=1}^{n}(X_{i}-\bar{X})(Y_{i}-\bar{Y})}{n-1}$

where, $\bar{X}$ is mean of X

and $\bar{Y}$ is mean of Y

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where, $\bar{x}$ is mean of the distribution.

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Standard deviation $(\sigma_{X})$ = 4.81

c. Using above formula we get,

Standard deviation $(\sigma_{Y})$ = 7.21

d. Correlation Coefficient is calculate by using formula:

$r_{xy}=\frac{S_{XY}}{S_{X}S_{Y}}$

where, $S_{XY}$ = Covariance of X and Y

$S_{X}$ = Standard Deviation of X

$S_{Y}$ = Standard Deviation of Y

Putting all values in above formula, we get,

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<em>Correlation Coefficient tell us that X and Y has negative week relationship whereas Sample Covariance tell us that X and Y has negative relationship. It does not tell us strength of relationship.</em>

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