3 years ago

4

Mathematics

1 answer:

frutty [35]3 years ago

3 0

Answer:

The answer is B

Step-by-step explanation:

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Step-by-step explanation:

Since we have given that

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so, z = 1.96

So, it becomes,

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=27.7\pm 1.96\times \dfrac{6.12}{\sqrt{50}}\\\\=27.7 \pm 1.69\\\\=(27.7-1.69,27.7+1.69)\\\\=(26.01,29.39)$

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