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sergij07 [2.7K]

2 years ago

13

A square is cut in half and the diagonal creating two equal triangles of each triangle has an area of 4.5 in.² what is the lengt

h in inches of the original square

1 answer:

rusak2 [61]2 years ago

5 0

8 Ft 9In i think dont kill me if its wrong

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Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

Population standard deviation, σ = $47

Margin of error = 5

95% Confidence Interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

$\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340$

Thus, the correct answer is

Option D) 340

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