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Helga [31]
3 years ago
12

Help please ...........

Mathematics
2 answers:
Klio2033 [76]3 years ago
7 0

Answer:

8/11, 7/9, 4/5, 84% these are the answers to your question

GarryVolchara [31]3 years ago
4 0
7/9 = 0.777777
8/11 = 0.727272
0.79
84% = 0.84
4/5 = 0.8

8/11, 7/9, 0.79, 4/5, 84%
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Answer:

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And we can find this probability with this difference:

P(-4

And in order to find these probabilities we can use tables for the normal standard distribution, excel or a calculator.  

P(-4

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 number of passengers who arrive at the platform of a population, and for this case we know the following info

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For this case we can assume that the random variable is normally distributed.

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(80

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P(-4

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