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andrezito [222]
3 years ago
15

Scores on a national math test are Normally distributed, with a mean score of 490 and a standard deviation of 50. Which test sco

re represents the top 20%, rounded to the nearest whole number?
Find the z-table here.

426
448
532
554
Mathematics
2 answers:
alisha [4.7K]3 years ago
7 0

Answer:

532

Step-by-step explanation:

The score that represents the top 20% = A score = 80%

Z score for 80% percentile = 0.842

We solve using the z score formula

z = (x-μ)/σ, where

x is the raw score = ??

μ is the population mean = 490

and σ is the population standard deviation = 50

Hence:

0.842 = x - 490/50

Cross Multiply

0.842 × 50 = x - 490

x = 0.842 × 50 + 490

x = 42.1 + 490

x = 532.1

Approximately = 532

Therefore, the test score = 532

11Alexandr11 [23.1K]3 years ago
7 0

Answer:

532

Step-by-step explanation:

edg 2020-2021

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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

<u>Use both points and find the slope:</u>

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<u>Find the line, using point-slope form and point (4, 4):</u>

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2 years ago
If x is the least common multiple of the set {6, 8, 12} and y is the greatest common factor
Anarel [89]

Answer:

12

Step-by-step explanation:

The least common multiple of {6,8,12} is 24. This can be intuitively figured by noting that any multiple of 12 is a multiple of 6 and that 12 is 1.5x larger than 8. That means we only have so multiple 12 by 2 and 8 by 3 for them to be equal. The GCF of {20,42,72} is 2 as the prime factorization of 20 is 2x2x5 and 42 is 2x3x7. That means even without having to check 72 (which is clearly even so 2 is a factor), we know that 2 is the greatest common factor that they could share. So X/Y = 24/2 = 12

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How many dogs are there in the world?
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Step-by-step explanation:

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Sienna, Rhys, and Micah are all reading the same book for school. Sienna has read 40% as far as Rhys has, and Rhys has read 40%
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Based on the fact that Sienna has read 60 pages, we can infer that Micha has read 375 pages of the book.

Sienna has read 40% of what Rhys has read and that corresponds to 60 pages. The number of pages read by Rhys is therefore:

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The 150 pages read by Rhys is 40% of what Micah has read. Micah has therefore read:

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In conclusion, Micah has read 375 pages.

<em>Find out more at brainly.com/question/2807698.</em>

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