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3 years ago

HEEEEEEELP MEEEEEEEE PLEASEEEEE ;(

Mathematics

1 answer:

Butoxors [25]3 years ago

6 0

Answer:

A.Now you have 30/40 and 28/40

B.So the answer is 3/4>7/10 >.

Step-by-step explanation:

First you need to get common denominators.

I will choose 40

3/4*10/10=30/40

7/10*4/4=28/40

A.Now you have 30/40 and 28/40

B.So the answer is 3/4>7/10 >.

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3 years ago

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Reika [66]

Answer:

The new mean is 5.

The new standard deviation is also 2.

Step-by-step explanation:

Let the sample space of hours be as follows, S = {x₁, x₂, x₃...xₙ}

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The standard deviation of this sample is 2. That is, $s=\frac{1}{n-1}\sum (x_{i}-\bar x)^{2}=2$ .

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The new sample is: S = {x₁ + 1, x₂ + 1, x₃ + 1...xₙ + 1}

Compute the mean of this sample as follows:

$\bar x_{N}=\frac{x_{1}+1+x_{2}+1+x_{3}+1+...+x_{n}+1}{n}\\=\frac{(x_{1}+x_{2}+x_{3}+...+x_{n})}{n}+\frac{(1+1+1+...n\ times)}{n}\\=\bar x+1\\=4+1\\=5$

The new mean is 5.

Compute the standard deviation of this sample as follows:

$s_{N}=\frac{1}{n-1}\sum (x_{i}-\bar x)^{2}\\=\frac{1}{n-1}\sum ((x_{i}+1)-(\bar x+1))^{2}\\=\frac{1}{n-1}\sum (x_{i}+1-\bar x-1)^{2}\\=\frac{1}{n-1}\sum (x_{i}-\bar x)^{2}\\=s$

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4 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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Answer:

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