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2 years ago

HELP HELP HELP HELP HELP HELP PLEASE

Mathematics

2 answers:

andreev551 [17]2 years ago

5 0

Answer:

It's 1!

Step-by-step explanation:

Hope this helps!! Please give me brainliest!!

Brilliant_brown [7]2 years ago

3 0

Answer: 1 $\frac{5}{27}$

Step-by-step explanation:

$\frac{8}{9} x 1\frac{1}{3} = 1\frac{5}{27}$

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FinnZ [79.3K]

(12 + 2v + 13v^3) + (13v^3 + 7 + 7v)
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2 years ago

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When sound is created it travels to the ear through a

dusya [7]

Answer:

medium

Step-by-step explanation:

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2 years ago

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Find the variance of the following data. Round your answer to one decimal place. x 1 2 3 4 5 P(X=x) 0.3 0.2 0.2 0.1 0.2

Reptile [31]

The variance of a distribution is the square of the standard deviation

The variance of the data is 2.2

<h3>How to calculate the variance</h3>

Start by calculating the expected value using:

$E(x) = \sum x* P(x)$

So, we have:

$E(x) = 1 * 0.3 + 2* 0.2 +3 * 0.2 + 4 * 0.1 + 5 * 0.2$

This gives

$E(x) = 2.7$

Next, calculate E(x^2) using:

$E(x^2) = \sum x^2* P(x)$

So, we have:

$E(x^2) = 1^2 * 0.3 + 2^2* 0.2 +3^2 * 0.2 + 4^2 * 0.1 + 5^2 * 0.2$

$E(x^2) = 9.5$

The variance is then calculated as:

$Var(x) = E(x^2) - (E(x))^2$

So, we have:

$Var(x) = 9.5 - 2.7^2$

$Var(x) = 2.21$

Approximate

$Var(x) = 2.2$

Hence, the variance of the data is 2.2