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QveST [7]
3 years ago
9

I need help with 19 20 21

Mathematics
1 answer:
lord [1]3 years ago
5 0
19) 5c+c=-6+2
      6c=-4
      c=-4/6
      c=-2/3

20) -20-8=-2e
       -28=-2e
       28/2=e
      14=e

21)p-2w=2l
     (p-2w)/2=l
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Answer:

P(12

And we can find this probability on this way:

P(-1

We expect around 68.27% between the two scores provided.

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:

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

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

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And we can find this probability on this way:

P(-1

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3 years ago
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vovikov84 [41]
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balu736 [363]

Answer:

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Step-by-step explanation:

mark as Brainlist

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Lesechka [4]

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heres an example...

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sweet-ann [11.9K]

Answer:

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 —————

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Step-by-step explanation:


6 0
3 years ago
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