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3 years ago

Write 4.4354 correct to 2 decimal places show working

2 answers:

8 0

To round this you would: You look at the number 5 because it's two decimal point away from the original point. If the number is less than 5 you round it down like this--4.4300 but if it more the 5 you round it up like this--4.4400

Vilka [71]3 years ago

7 0

The answer is 4.4400 as you wanted it to be rounded

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A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of

myrzilka [38]

Answer:

Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:

$X \sim N(60,13.5)$

Where $\mu=60$ and $\sigma=13.5$

And for this case we select a sample size of n= 81. Since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

And the standard error of the mean would be:

$\sigma_{\bar X} =\frac{13.5}{\sqrt{81}}= 1.5$

4.1.5

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".

Solution to the problem

Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:

$X \sim N(60,13.5)$

Where $\mu=60$ and $\sigma=13.5$

And for this case we select a sample size of n= 81. Since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

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

And the standard error of the mean would be:

$\sigma_{\bar X} =\frac{13.5}{\sqrt{81}}= 1.5$

4.1.5

7 0

3 years ago

Candy buys 20 ounces of nuts. Puts equal number of ounces in each of 3 bags. How many ounces of mixed nuts in each bag

Tema [17]

Answer:

she put 6oz in each bag

Step-by-step explanation:

I say this because 20 divided by 3 is 6.6666666667 and she has extra but not enough to put in each one of their bags so she just puts 6oz in each one

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3 years ago

What evidence do scientists have that erosion works slowly over long periods of time?

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<span>A noticeable evidence is that the Amazon was formed as a result of wearing away that has occurred over millions of years. Another good example is the Grand Canyon in the United States of America, it was formed as a result of erosion that occurred over 3 million years.</span>

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Answer:

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3 years ago

How many solutions does this equation have?

Bess [88]

Answer: One solution (1 1/6)

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