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Talja [164]
2 years ago
8

Please answer this question, i need it to be explained also.please

Mathematics
2 answers:
Anettt [7]2 years ago
8 0

Answer:

6.6

Step-by-step explanation:

If you minus 54.2 and 47.6 you get 6.6

54.2

-<u>47.6</u>

6.6

QveST [7]2 years ago
3 0

Answer:

2.64

Step-by-step explanation:

54.2 - 47.6 = 6.6

Selena's tree is 6.6 CMS taller.

We need to convert that into inches, I believe.

1 cm = 0.4 inches

6.6 cms into inches = 2.5984252, est. 2.6

Not an answer choice, another way to find this is

6.6 x 0.4 = 2.64

Which is an answer choice, so your answer should be the last one, 2.64.

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vekshin1

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2 years ago
Risk taking is an important part of investing. In order to make suitable investment decisions on behalf of their customers, port
GrogVix [38]

Answer:

a=49.5 -1.28*15=30.3

So the value of height that separates the bottom 10% of data from the top 90% is 30.3.  

If the score is lower than 30.3 we consider this score as risk averse

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 scores of a population, and for this case we know the distribution for X is given by:

X \sim N(49.5,15)  

Where \mu=49.5 and \sigma=15

We are interested in the bottom 10% of the data.

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.9   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.1 of the area on the left and 0.9 of the area on the right it's z=-1.28. On this case P(Z<-1.28)=0.1 and P(z>-1.28)=0.9

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=-1.28

And if we solve for a we got

a=49.5 -1.28*15=30.3

So the value of height that separates the bottom 10% of data from the top 90% is 30.3.  

If the score is lower than 30.3 we consider this score as risk averse

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2 years ago
A forest preserve had 275,301 pine trees. Rangers planted 21,748 new trees. How many trees does the forest preserve have now?
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Answer:

Step-by-step explanation:

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