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LekaFEV [45]
2 years ago
7

7.) A window washing company has a contract to wash 3,082 windows on a 23

Mathematics
1 answer:
SOVA2 [1]2 years ago
5 0
134 windows on each floor
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An experiment will be conducted to test the effectiveness of a weight-loss supplement. Volunteers will be randomly assigned to t
DerKrebs [107]

Answer:

Option c. The distributions of weight loss of the two treatments are approximately normally distributed.

Step-by-step explanation:

To increase the confidence level, the results must be able to satisfy the following conditions:

  • The sample size is increased. This reduces the margin of the error in the sampling experiment.
  • Reduction of the variability. This means that the less the data varies, the more precise the data is.
  • Using the one-sided confidence level
  • Lowering the confidence level.

All these characteristics can only be satisfied by the normal distribution curve.

3 0
3 years ago
This is quadratic equations <br> Help asap!!
lord [1]

Answer:

x = - 3 ± \sqrt{2}

Step-by-step explanation:

x² + 6x + 7 = 0 ( subtract 7 from both sides )

x² + 6x = - 7

using the method of completing the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(3)x + 9 = - 7 + 9

(x + 3)² = 2 ( take square root of both sides )

x + 3 = ± \sqrt{2} ( subtract 3 from both sides )

x = - 3 ± \sqrt{2}

3 0
2 years ago
What’s the value of x???
Black_prince [1.1K]

Answer:??? sorry i dont know

Step-by-step explanation:

3 0
3 years ago
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In this problem, we explore the effect on the standard deviation of adding the same constant to each data value in a data set. c
goldenfox [79]

The standard deviation of both the data are the same which is 3.67 and adding the same constant c to each data value results in the standard deviation remaining the same.

<h3>What is the standard deviation?</h3>

It is defined as the measure of data disbursement, It gives an idea about how much is the data spread out.

We have a data set:

8, 16, 14, 8, 16

As we know the formula for standard deviation is:

\rm \sigma = \sqrt{\dfrac{ \sum (x_i-X)}{n}

Here σ is the standard deviation

xi is each value from the data set

X is the mean of the data set

n is the number of observation in data set.

X = (8+16+14+8+16)/5 = 12.4

n = 5

After calculating the standard deviation will be:

σ = 3.67

Add 8 to each data value to get the new data set 16, 24, 22, 16, 24.

New standard deviation:

σ(new) = 3.67

The standard deviation of both the data are same we can say the standard deviation does not change when we add a constant to each data value.

Adding the same constant c to each data value results in the standard deviation remaining the same.

Thus, the standard deviation of both the data are the same which is 3.67 and adding the same constant c to each data value results in the standard deviation remaining the same.

Learn more about the standard deviation here:

brainly.com/question/12402189

#SPJ1

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Which triangles are similar Please helpppp quickkkkk
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Triangle A and Triangle B

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