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3 years ago

(x + 20 Solve for x: 2 = 3x Ox= 10 Ox=4 Ox=-14 Ox=-17

Mathematics

2 answers:

12345 [234]3 years ago

7 0

Step-by-step explanation:

x=10

I hope it helps you please mark me as a brainleiest

maxonik [38]3 years ago

6 0

Answer:

$\pmb{x=10 }$

Step-by-step explanation:

x+20=3x

3x-x=20

2x=20

x=20/2

x=10

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Effectus [21]

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Step-by-step explanation:

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2 years ago

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2 years ago

Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

4 0

3 years ago

Read 2 more answers

Which of these expressions is equivalent to – 4(5 – 2x)?

Alekssandra [29.7K]

Answer:

-20+8x

Step-by-step explanation:

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2 years ago

Read 2 more answers

The amount of water dispensed by a water dispenser is normally distributed,

Contact [7]

Answer:

The correct answer is - C. 11.45 ounces to 11.75 ounces.

Step-by-step explanation:

According to the empirical rule of the distribution for 68% falls under the normal curve falls within 1 standard deviation of the mean.

That is:

μ±δ

From the given information, the mean is

μ = 11.60

and the standard deviation is

δ = 0.15

We substitute the given parameters to obtain;

11.60±0.15

11.75 and 11.45

This means the lower limit is

11.45

and the upper limit is

11.75

3 0

3 years ago