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NISA [10]
3 years ago
11

Which number line represents the solution to the equation 2x + 6 = 12

Mathematics
1 answer:
s2008m [1.1K]3 years ago
4 0

Answer:

x=3

Step-by-step explanation:

2*3=6  6+6=12

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Data on IQ for 33 first graders are given as follows: 82, 96, 99, 102, 103, 103, 106, 107, 108, 108, 108, 108, 109, 110, 110, 11
Dahasolnce [82]

Answer:

\bar X = \frac{\sum_{i=1}^n x_i}{n}

Where n represent the sample size, on this case n =33. If we use this formula we got:

\bar X = 113.727

And for this case we know that is the best estimator since is an unbiased estimator for the true population mean since we have this:

E(\bar X) = E(\frac{\sum_{i=1}^n x_i}{n})= \frac{1}{n} \sum_{i=1}^n E(X_i) = \frac{n\mu}{n} = \mu

Step-by-step explanation:

For this case we have the following values given:

82, 96, 99, 102, 103, 103, 106, 107, 108, 108, 108, 108, 109, 110, 110, 111, 113, 113, 113, 113, 115, 115, 118, 118, 119, 121, 122, 122, 127, 132, 136, 140, 146

And we want to estimate the mean value of IQ for the conceptual population.

For this case we can use as estimator for the population mean the sample mean. We know that the sample mean is given by this formula:

\bar X = \frac{\sum_{i=1}^n x_i}{n}

Where n represent the sample size, on this case n =33. If we use this formula we got:

\bar X = 113.727

And for this case we know that is the best estimator since is an unbiased estimator for the true population mean since we have this:

E(\bar X) = E(\frac{\sum_{i=1}^n x_i}{n})= \frac{1}{n} \sum_{i=1}^n E(X_i) = \frac{n\mu}{n} = \mu

5 0
3 years ago
A camera has a listed price of $691.99 before tax. If the sales tax rate is 9.75%, find the total cost of the camera with sales
Alja [10]
You will first change the percentage into a decimal. This will turn out to be 0.0975. Next, you take that decimal and do 691.99 times 0.0975. You will then get 67.46902... You then add that number with 691.99. That is the answer. You should get 759.46. (This is rounded to the nearest cent.
8 0
3 years ago
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grandymaker [24]

Answer:

21/26 percent chance and if you count Y as a vowel 20/26


5 0
4 years ago
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what’s transformation is the result of reflect in the original figure across the Y-axis and then across the X-axis
antoniya [11.8K]

Answer:

D

Step-by-step explanation:

When reflected across the Y it becomes B, but then across the X, it fits into D.

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Adrian, Ben and Charlie share some sweets in the ratio of 8:5:10.
aniked [119]

Answer:

the answer is in the image attached

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