2 years ago

Which of the sentence is true?

Mathematics

1 answer:

algol132 years ago

4 0

Answer:

The graph of the circle is not a function

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Mean:

$E(X) = \displaystyle \sum_{x\in\{1,2,3,4\}}x\,P(X=x) = 1\times0.4 + 2\times0.1 + 3\times0.3 + 4\times0.2 = \boxed{2.3}$

Variance:

$\displaystyle V(X) = E\left((X-E(X))^2\right) = E(X^2) - E(X)^2 \\\\ E(X^2) = \sum_{x\in\{1,2,3,4\}}x^2\,P(X=x) = 1^2\times0.4 + 2^2\times0.1 + 3^2\times0.3 + 4^2\times0.2 = 6.7 \\\\ \implies V(X) = 6.7 - 2.3^2 = \boxed{1.41}$

Standard deviation:

$\sigma_X = \sqrt{V(X)} = \sqrt{1.41} \approx \boxed{1.19}$

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3 years ago

EVERYBODY LOOK. <br><br> ^^^^^^^^^^^^^^^^^^^

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3 years ago

A dripping faucet leaps 1.8 ounces per minute. How many ounces leak in 30 minutes?

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Step-by-step explanation:

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