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4 years ago

Pleasee help!!! (brainlest) (15 points)

Mathematics

2 answers:

Masteriza [31]4 years ago

6 0

-1400 + 800 - 350 = - 950 meters

USPshnik [31]4 years ago

5 0

-1400 + 800 - 350 = - 950 meters

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Write an equation, please help

ale4655 [162]

Answer:

y = -6/5x + 2

4 0

3 years ago

Read 2 more answers

Six measurements were made of the magnesium ion concentration (in parts per million, or ppm) in a city's municipal water supply,

myrzilka [38]

Answer:

$163.83-4.03\frac{20.094}{\sqrt{6}}=130.77$

$163.83+4.03\frac{20.094}{\sqrt{6}}=196.89$

So on this case the 99% confidence interval would be given by (130.77;196.89)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Data: 175 177 175 180 138 138

We can calculate the mean and the deviation from these data with the following formulas:

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

$s=\sqrt{\frac{\sum_{i=1}^n (x_i -\bar X)^2}{n-1}}$

$\bar X=163.83$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s=20.093 represent the sample standard deviation

n=6 represent the sample size

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=6-1=5$

Since the Confidence is 0.99 or 99%, the value of $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,5)".And we see that $t_{\alpha/2}=4.03$

Now we have everything in order to replace into formula (1):

$163.83-4.03\frac{20.094}{\sqrt{6}}=130.77$

$163.83+4.03\frac{20.094}{\sqrt{6}}=196.89$

So on this case the 99% confidence interval would be given by (130.77;196.89)

7 0

3 years ago

List statements and proofs that show that PQ is congruent to RS. I will give brainliest to best answer

makkiz [27]

Answer:

Given - PS is parallel to QR

angle QPS is congruent to angle SRQ

To prove - PQ is congruent to RS

Solution -

In triangle PSQ and SQR

Angle PSQ = Angle SQR ( Interior Angle form by the parallel lines are equal i.e PQ is parallel to QR)

Angle P = Angle R (given)

SQ = SQ ( common)

PSQ = SQR ( prove above)

By ASA Congruence criteria Triangle PQS is congruent to triangle QRS

By CPCT PS is congruent to RS

Hence, Proved

6 0

3 years ago

Write the correct comparison (< = > or =) in each box

Pavel [41]

2...bigger =3/5 less 1/8

8 0

3 years ago

What is the answer?

Maurinko [17]

Answer:

2.25

Step-by-step explanation:

Put the ages in each list in order from smallest to largest.

Smith: 62, 63, 63, 64, 64, 65, 66, 66, 67, 68

Thompson: 75, 76, 76, 77, 78, 78, 79, 80, 80, 81

Find the mediant (number in the middle of the sorted list). There are 10 numbers in each list, so average the 5th and 6th numbers because they are nearest the middle.

Smith: (64 + 65)/2 = 64.5

Thompson: (78 + 78)/2 = 78

The difference between the medians is 78 - 64.5 = 13.5

The range (the difference between smallest and largest age) is 6 for each of the two lists.

13.5 = (multiplier)(6)

multiplier = 13.5 / 6 = 2.25

6 0

3 years ago