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ololo11 [35]
3 years ago
10

Write words to match the expression. 3+(4x12)

Mathematics
2 answers:
IgorLugansk [536]3 years ago
3 0
Add three to the product of 4 times twelve
AVprozaik [17]3 years ago
3 0
 <span>3 plus the quantity 4x (or 4 times x) times 12 </span>
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Kyle wants to buy a new laptop that has an original price of $540. The store is having a sale, so the laptop is 10 percent off,
Andrews [41]

Answer:

4.32 percentage

Step-by-step explanation:

  • 540/1×8/100
  • 54×8/10
  • 4.32
7 0
3 years ago
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The U.S. Department of Agriculture records data on farm acreage and number of farms by county for every county in the country. T
lisabon 2012 [21]

Solution :

From the table,

Number of countries = $N_i$

Mean = $\overline Y_i$

Standard deviation = $\sigma_i$

Margin of error of B = 50,000 acres

So we determine the $\text{sample size n}$ and then allocate the four regions of $n_1, n_2, n_3$ and $n_4$.

Under the $\text{proportional allocation}$, the $\text{equation}$ for the value of $n_1$ which yields $V(\overline Y_{st}) = D = \frac{B^2}{H}$  is given by :

$n=\frac{\sum_{K=1}^L N_K \sigma^2_K}{ND+\frac{1}{N}\sum_{K=1}^L N_K \sigma^2_K}$

Let us complete the numerator

$\sum_{K=1}^L N_K \sigma^2_K = N_1\sigma_1^2 + N_2\sigma_2^2 + N_3\sigma_3^2 + N_4\sigma_4^2$

                $= 1052 \times (271)^2 +  210 \times (79)^2 + 1376 \times (244)^2 + 418 \times (837)^2 $

                = 453329920

The bound on the error of estimation is B = 50,000 acres

Hence we get

$D=\frac{B^2}{H}$

  $=\frac{50000^2}{4}$

  = 625,000,000

$n=\frac{\sum_{K=1}^L N_K \sigma^2_K}{ND+\frac{1}{N}\sum_{K=1}^L N_K \sigma^2_K}$

  $=\frac{453329920}{3056 \times 625 + \frac{1}{3056} \times 453329920}$

 = 220.24044

≈ 221 (approximately)

Therefore, the sample size under the proportional allocation from each stratum are given by :

$n_1=n\left[\frac{N_1}{\sum_{K=1}^\mu N_K}\right]$

   $=221\left[\frac{1052}{3056}\right]$

   ≈ 76

$n_2=n\left[\frac{N_2}{\sum_{K=1}^\mu N_K}\right]$

   $=221\left[\frac{210}{3056}\right]$

   ≈ 15

$n_3=n\left[\frac{N_3}{\sum_{K=1}^\mu N_K}\right]$

   $=221\left[\frac{1376}{3056}\right]$

   ≈ 100

$n_4=n\left[\frac{N_4}{\sum_{K=1}^\mu N_K}\right]$

   $=221\left[\frac{418}{3056}\right]$

   ≈ 30

Thus, we should select 76 counties from North central region, 15 counties from the north east region, 100 from south region and 30 from west region.

We can also estimate mean acreage of each county across all the county with a margin of error of 50,000 acres.

8 0
3 years ago
Can sum1 help me asap plssss
GuDViN [60]

Answer:

33.27

Step-by-step explanation:

3 0
3 years ago
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Audrey has a house worth $120,000, a
Artist 52 [7]
New worth 928,181 that’s the answer
7 0
3 years ago
Stephen was disappointed in his grade on a recent statistics test. He calculated his 2-score and found that it was 0.45. What pe
grin007 [14]
I would say 2 because it says he calculated his 2- score.
7 0
3 years ago
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