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4 years ago

I need help on number 3 6 7 8 9 and 10 please I’ll give you brainliest

Mathematics

1 answer:

pantera1 [17]4 years ago

5 0

Answer:

im not sure

3. B

Step-by-step explanation:

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A researcher collected data from a sample of correctional officers and found that on average they made 47,173 dollars a year wit

ollegr [7]

Answer:

a) $z = \frac{40000- 47173}{6364} = -1.127$

b) $z = \frac{50000- 47173}{6364} = 0.444$

c) $P(X>40000)=P(\frac{X-\mu}{\sigma}>\frac{40000-\mu}{\sigma})=P(Z>\frac{40000-47173}{6364})=P(z>-1.127)$

And we can find this probability using the complement rule and the normal standard distribution or excel and we got:

$P(z>-1.127)=1-P(z$

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".

Part a

Let X the random variable that represent the amount of money of a population of interet, and we know the following info:

Where $\bar X=47173$ and $s=6364$

We can assume that the sample size is large and the estimators can be used as a good description for the parameters $\mu \sigma$

The z score for 40000 would be:

$z = \frac{40000- 47173}{6364} = -1.127$

Part b

The z score for 50000 would be:

$z = \frac{50000- 47173}{6364} = 0.444$

Part c

We are interested on this probability

$P(X>40000)$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(X>40000)=P(\frac{X-\mu}{\sigma}>\frac{40000-\mu}{\sigma})=P(Z>\frac{40000-47173}{6364})=P(z>-1.127)$

And we can find this probability using the complement rule and the normal standard distribution or excel and we got:

$P(z>-1.127)=1-P(z$

8 0

3 years ago

Please help I'll mark brainliest

AVprozaik [17]

You have to keep the same number in the book

5 0

2 years ago

If a diagram is unmarked, can you assume...

Rudik [331]

Both pairs of vertical angles (four angles altogether) always sum to a full angle(360°). In the figure above, an angle from each pair of vertical angles are adjacentangles and are supplementary (add to 180°). For example, in the figure above, m∠JQL + m∠LQK = 180°.

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3 years ago

Read 2 more answers

The product of 9 and m is 45

Kamila [148]

9 * m = 45

divide both sides by 9:-

m = 5

3 0

4 years ago

Which expression represents the follow-

Varvara68 [4.7K]

Answer:

the sum of x and 5.

x + 5

the sum of is adding

4 0

4 years ago