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12345 [234]
3 years ago
13

Find the solution set for the system of equations. 9x + 5y = 28 5x + 9y = 56

Mathematics
1 answer:
masha68 [24]3 years ago
5 0
9x + 5y = 28 . . . . . (1)
5x + 9y = 56 . . . . . (2)

(1) x 5 => 45x + 25y = 140 . . . . . (3)
(2) x 9 => 45x + 81y = 504 . . . . . (4)

(3) - (4) => --56y = -364 => y = 6.5

From (1), 9x + 5(6.5) = 28 => 9x = 28 - 32.5 = -4.5 => x = -4.5/9 = -0.5
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Question Help Of 515515 samples of seafood purchased from various kinds of food stores in different regions of a country and gen
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(0.5848 ; 0.6552)

We are confident that about 58% to 66% of sea foods in the country are Mislabelled.

No, criticism isnt valid and generalization can be made once the assumptions for constructing a confidence interval is met.

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Confidence level = 90% = Zcritical at 90% = 1.645

Confidence interval = (p ± margin of error)

Margin of Error = Zcritical * sqrt[(p(1-p))/n]

Margin of Error = 1.645 * sqrt[(0.62(0.38))/515]

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We are confident that about 58% to 66% of sea foods in the country are Mislabelled.

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