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soldi70 [24.7K]
4 years ago
14

A. x = 40 c. x = 20 b. x = 10 d. x = 15

Mathematics
2 answers:
velikii [3]4 years ago
6 0

Answer:

B

Step-by-step explanation:

Multiply x/20 each side

Marianna [84]4 years ago
6 0

Answer:

b

Step-by-step explanation:

20/x=2

*x        *x

20=2x

:2     :2

10=x

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The probability distribution of a random variable X is given. x 1 2 3 4 P(X = x) 0.4 0.1 0.3 0.2 Compute the mean, variance, and
Readme [11.4K]

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}

5 0
3 years ago
What are the dimensions of the base of the pyramid?
timama [110]

Answer:

B.8 ft by 3 ft.

Step-by-step explanation:

The dimensions of the pyramid, expressed in ancient Egyptian units of measurement, were 280 cubits high, a base length of 440 cubits, with a seked of 512 palms (a slope of 51°50'40").

4 0
3 years ago
A 1,100 kg car is going 22m/s. What force is needed to stop it in 2.0 seconds?
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Answer:

brick wall lol

Step-by-step explanation:

5 0
3 years ago
What is the best estimate for 82% of 503?
AleksAgata [21]
82% of 503 is 412.46 hope this helps
5 0
3 years ago
How do I find the domain of f(x)=5x^2+4. When 0&lt;=x&lt;=2<br><br> #54
Blizzard [7]

Hi

if 0 ≤ x ≤ 2

0^2\leq x^2\leq 2^2

Multiplied by 5..... 5×0^2 \leq 5x^2\leq 5×2^2

add 4  .........5×0^2+4 \leq 5x^2+4\leq 5×2^2+4

so ........4\leq 5x^2+4\leq 24



4 0
3 years ago
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