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Elden [556K]
3 years ago
15

Scores on the mathematics part of the SAT exam in a recent year were roughly Normal with mean 455 and standard deviation 120. Yo

u choose an SRS of 100 students and average their SAT math scores. If you do this many times, with a sample of size 100 each time, the standard deviation of the average scores will get close to:A. 120 B. 1.2 C. 12 D. None of the above.
Mathematics
1 answer:
laila [671]3 years ago
7 0

Answer:

its a

Step-by-step explanation:

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Oduvanchick [21]
ANSWER: x = 1/3

WORKING OUT:

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3 years ago
Marcos purchased a sail boat for $56,900. He anticipates each year the boat will decrease in value by 8.1% from the previous yea
Varvara68 [4.7K]

Answer: 56,900\left( 0.919\right)^x

Step-by-step explanation:

Given

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After 1 year it is

\Rightarrow 56,900-56,900\times 0.081\\\Rightarrow 56,900\left( 1-0.081\right)\\

after another year it becomes

\Rightarrow 56,900\left( 1-0.081\right)-56,900\left( 1-0.081\right)\times 0.081\\\Rightarrow 56,900\left( 1-0.081\right)\cdot \left( 1-0.081\right)\\\Rightarrow 56,900\left( 1-0.081\right)^2

After x years it is

\Rightarrow 56,900\left( 1-0.081\right)^x

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5 0
2 years ago
(6z 2 - 4z + 1)(8 - 3z).
Yakvenalex [24]
Distributive property
a(b+c)+ab+ac
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8(6z^2-4z+1)-3z(6z^2-4z+1)=
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7 0
3 years ago
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aleksandr82 [10.1K]
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3 years ago
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GalinKa [24]

Answer: I believe its 5/9

Step-by-step explanation:  

As you can see, the only fraction that doesn't equal 0.53, or the outlier, is 5/9 or 0.5556

5 0
3 years ago
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