3 years ago

Hurry please

Mathematics

1 answer:

Troyanec [42]3 years ago

7 0

Answer:

hola no entiendo :) por favor traduce

Step-by-step explanation:

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The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher

ELEN [110]

Answer:

Option D) 340

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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3 years ago

1/3 to 2/3 percentage increase or decrease

Leto [7]

Answer:

increase

Step-by-step explanation:

the number got bigger

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4 years ago

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I need help please and thank you

omeli [17]

Oof I’m not quite sure how to do that

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3 years ago

Solve for x<br> 4(x + 1) = –28

lora16 [44]

Answer:

X=-8

Step-by-step explanation:

4x+4=-32

Add -4 to both sides

4x=-32

decide both sides by 4

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help me the area of a rectangular roof of a doghouse is 756 square inches. the length of the roof is 108 inches. how many inches

Andrei [34K]

$A=L*w \\ A=756 \ square \ inches \\L=108 \ inches \\ \\ 108*w=756 =>w=756:108 \\ \\ w=7 \ inches$

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