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Levart [38]
3 years ago
12

Need some help on this one pls (marking brainlist) :D​

Mathematics
1 answer:
Kazeer [188]3 years ago
5 0

Answer:

Step-by-step explanation:

Cos = Adj/hyp

A^2 + 24^2 = 25^2

A^2 = 49

a=7

7,24,25 triangle

opposite= 24

Adjencent = 7

Hypotenuse=25

CosФ = 25/7

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Given: A Gallup survey of 2322 adults (at least 18 years old) in the U.S. found that 408 of them have donated blood in the past two years.

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The confidence interval for population proportion:

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A 90% confidence interval for the population proportion of adults in the U.S. who have donated blood in the past two years:

0.176\pm (1.645)(\sqrt{\dfrac{0.176(1-0.176)}{2322}})\\\\=0.176\pm (1.645)(0.0079)\\\\=(0.176\pm0.013)\\\\=(0.176-0.013,0.176+0.013))\\\\=(0.163,0.189)

Hence,

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