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Rama09 [41]
4 years ago
14

21= 1/4 x

Mathematics
2 answers:
never [62]4 years ago
6 0

Answer:

Yes

Step-by-step explanation:

21= 1/4 x

21* 4 = x

x = 84

28 = 1/3x

28*3 = x

x = 84

KatRina [158]4 years ago
4 0

Answer:

x = 84

Step-by-step explanation:

21 = 1/4x ....multiply both sides by 4

4 * 21 = (1/4 * 4/1)x

84 = 1x or just 84 = x

28 = 1/3x...multiply both sides by 3

3 * 28 = (1/3 * 3/1)x

84 = 1x or just 84 = x

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Mean:

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\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}

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3 years ago
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