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3 years ago

Which error, if any, was made?

Mathematics

2 answers:

Ksivusya [100]3 years ago

8 0

2x-8=12
First you add 8 to both sides...
2x = 20
Then you divide each side by 2...
x = 20
Done

Wrong things...
- did not do the same thing to the entire side of each side
- wrong multiplication choice

LiRa [457]3 years ago

6 0

$2x-8=12\ \ \ \ |\cdot\dfrac{1}{2}\\\\\left(\dfrac{1}{2}\right)2x-\left(\dfrac{1}{2}\right)8=12\ \ \ |\text{here you have the mistake}\\\\\\\boxed{\text{The multiplication property of equality was not applied correctly.}}$

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Answer:

$X \sim N(3.6,5)$

Where $\mu=3.6$ and $\sigma=5$

Then we have:

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With the following parameters:

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Step-by-step explanation:

Previous concepts

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Solution to the problem

Let X the random variable that represent the number of cars running a red light of a population, and for this case we know the distribution for X is given by:

$X \sim N(3.6,5)$

Where $\mu=3.6$ and $\sigma=5$

Since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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With the following parameters:

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3 years ago

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