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Dahasolnce [82]
2 years ago
5

Evaluate each expression for the given value of the variable. x + 2x - x - 1; x = 2

Mathematics
2 answers:
MaRussiya [10]2 years ago
6 0

x + 2x - x - 1

  • Substitute 2 for x into the expression.

(2) + 2(2) - (2) - 1

  • Multiply 2 * 2 first.

(2) + (4) - (2) - 1

  • Solve from left to right.
  • (2 + 4) - 2 - 1 = 6 - 2 - 1

6 - 2 - 1

  • Solve from left to right.
  • (6 - 2) - 1 = 4 - 1

4 - 1 = 3

<h3>Your answer is 3.</h3>
ryzh [129]2 years ago
4 0
The Equation is

x + 2x - x - 1 = 0

The Value of x = 2 ,

Putting in Equation , we get

2 + (2 × 2) - 2 - 1 = 0

2 + 4 - 2 - 1 = 0

6 - 3 = 0

The Answer is 3
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Nikitich [7]

Answer:

Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

Where \mu=2.5 and \sigma=1.7

We select a sample of n =64 >30 and we can apply the central limit theorem. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And for this case the standard error would be:

\sigma_{\bar X} = \frac{1.7}{\sqrt{64}}= 0.2125

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

The central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Solution to the problem

Let X the random variable that represent the number of children per fammili of a population, and for this case we know the following info:

Where \mu=2.5 and \sigma=1.7

We select a sample of n =64 >30 and we can apply the central limit theorem. From the central limit theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And for this case the standard error would be:

\sigma_{\bar X} = \frac{1.7}{\sqrt{64}}= 0.2125

6 0
3 years ago
I need help on math (polz dont give helpless answer)
o-na [289]

Answer:

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Step-by-step explanation:

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2 years ago
Find the missing measure and write your solution on the blank provided
photoshop1234 [79]

Answer:

5: c=65  d=125  e=60

6: c= 58 d= 121 e=63

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8. a=61 b=55 c=64

Step-by-step explanation: :)

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The scatter plot shows the heights ( in inches) and the shoe sizes of eight men. What is the height of the man whose shoe size i
Bas_tet [7]

Answer: 72 inches

Step-by-step explanation:

6 0
2 years ago
Using f(x)=2x-3 and g(x)=4x, what is f(2) - g(3)
Rashid [163]
First fine f(2).

f(2) = 2*2 - 3
f(2) = 4 - 3
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Now g(3).

g(3) = 4*3
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Now subtract 1 - 12 = -11

-11 is your answer.
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3 years ago
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