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ale4655 [162]
3 years ago
5

I'm sorry but what!? Can someone help?

Mathematics
2 answers:
MaRussiya [10]3 years ago
8 0

Answer:

x=2

Step-by-step explanation:

tatiyna3 years ago
7 0

Step-by-step explanation:

Axis of symmetry for quadratic ax² + bx² + c:

x = -b/2a.

Therefore for y = x² - 4x + 2,

-b/2a = -(-4)/2(1) = 2

The axis of symmetry is x = 2.

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On a standardized test with a normal distribution the mean score was 67.2. The standard deviation was 4.6. What percent of the d
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Answer:

P ( -1 < Z < 1 ) = 68%

Step-by-step explanation:

Given:-

- The given parameters for standardized test scores that follows normal distribution have mean (u) and standard deviation (s.d) :

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- The random variable (X) that denotes standardized test scores following normal distribution:

                         X~ N ( 67.2 , 4.6^2 )

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                          P ( (62.6 - 67.2) / 4.6 < Z < (71.8 - 67.2) / 4.6 )

                          P ( -1 < Z < 1 )

- Using the The Empirical Rule or 68-95-99.7%. We need to find the percent of data that lies within 1 standard about mean value:

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                          P ( -2 < Z < 2 ) = 95%

                          P ( -3 < Z < 3 ) = 99.7%

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