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3 years ago

PLEASE HELP !! ILL GIVE BRAINLIEST EXTRA 40 POINTS DONT SKIP :(( .!

Mathematics

1 answer:

Llana [10]3 years ago

6 0

Define your two QUESTIONS

Write your system of EQUATIONS

SOLVE the system of equations.

Find the SOLUTION to the question being asked.

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In Applied Life Data Analysis (Wiley, 1982), Wayne Nelson presents the breakdown time of an insulating fluid between electrodes

ale4655 [162]

Answer:

The sample mean is $\bar{x}=14.371$ min.

The sample standard deviation is $\sigma = 18.889$ min.

Step-by-step explanation:

We have the following data set:

$\begin{array}{cccccccc}0.15&0.82&0.81&1.44&2.70&3.28&4.00&4.70\\4.96&6.49&7.25&8.03&8.40&12.15&31.89&32.47\\33.79&36.80&72.92&&&&&\end{array}$

The mean of a data set is commonly known as the average. You find the mean by taking the sum of all the data values and dividing that sum by the total number of data values.

The formula for the mean of a sample is

$\bar{x} = \frac{{\sum}x}{n}$

where, $n$ is the number of values in the data set.

$\bar{x}=\frac{0.15+0.82+0.81+1.44+2.7+3.28+4+4.7+4.96+6.49+7.25+8.03+8.4+12.15+31.89+32.47+33.79+36.80+72.92}{19}\\\\\bar{x}=14.371$

The standard deviation measures how close the set of data is to the mean value of the data set. If data set have high standard deviation than the values are spread out very much. If data set have small standard deviation the data points are very close to the mean.

To find standard deviation we use the following formula

$\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{x}\right)^2 }}{n-1} }$

The mean of a sample is $\bar{x}=14.371$ .

Create the below table.

Find the sum of numbers in the last column to get.

$\sum{\left(x_i - \overline{X}\right)^2} = 6422.0982$

$\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{x}\right)^2 }}{n-1} } = \sqrt{ \frac{ 6422.0982 }{ 19 - 1} } \approx 18.889$

7 0

3 years ago

According to the Bureau of Labor Statistics, students who have an after-school job spend an average of 42 fewer minutes per day

IgorLugansk [536]

Answer:

126 hrs

Step-by-step explanation:

-Given the school year has 180 days and the non-working student spends 42 minutes more than the working student.

-The total time during the school year is calculated as;

$Total Time=Time/day \times No \ of \ Days\\\\=42\ minutes \times 180\\\\=7560\ minutes$

We convert our calculated time in hour(1hr=60 minutes):

$=\frac{7560\ mins}{60\ mins}\\\\=126\ hrs$

Hence, the average non-working spends an average of 126 hrs that the working student.

4 0

3 years ago

Pls help me I will pick brainliest answer with tape diagram

NikAS [45]

Answer:

5mins- 300s

210mins- 12600s

5mins-3

210mins-?

300/3=12600/x

x=12600/300 x 3

=126

or 210/5=42

42x3=126

6 0

3 years ago

A parking lot is 100 yards long what is the length off 3/4if the parking lot

andriy [413]

I think you mean:
A parking lot is 100 yards long. What is the length of 3/4 of the parking lot?

3/4 * 100 Mathematical Expression.

3/1 * 25 Simplify.

75 Multiply.

Final Answer: 75 yards long

4 0

3 years ago

Help me please!!!!!!!!!

Delvig [45]

The answer is 200 $\pi$

3 0

3 years ago

PLEASE HELP !! ILL GIVE BRAINLIEST *EXTRA 40 POINTS* DONT SKIP :(( .!

PLEASE HELP !! ILL GIVE BRAINLIEST EXTRA 40 POINTS DONT SKIP :(( .!