PLEASE HELP ME I NEED HELP PLEASE ASAP<br> BRAINLIEST AND 50POINTS

Your friend is about to begin an introductory chemistry course at his university. The course has collected data from students on

Minchanka [31]

Answer:

<em>The percentage of students sudy 34 hours or more is 0.62%</em>

Step-by-step explanation:

<u>The Normal Distribution</u>

The bell curve or normal distribution is frequently used to model the probability of natural random events. The normal distribution $N(\mu,\sigma)$ is characterized by two parameters:

$\mu$ is the mean value

$\sigma$ is the standard deviation

The study times in hours for the final exam is modeled as a normal distribution N(24,4). We are required to find the percentage of students study 34 hours or more, or P(X>34).

The values for the cumulative probability are given by tables or digital means like Excel where we can get the left-tail or P(X<Xo). To compute the right-tail or P(X>Xo) we use this relation

$P(X>Xo) =1-P(X$

The Excel formula to find the left-tail cumulative probability is called

NORM.DIST(x,mean,standard_dev,cumulative)

To solve the question, we used:

NORM.DIST(34,24,4,TRUE)=0.9938

Thus:

$P(X>34) =1-P(X$

The percentage of students study 34 hours or more is 0.62%

6 0

3 years ago

The diagram shows 5cm×5cm×5cm cube calculate the length of the diagonal ab

mario62 [17]

Answer:

AB = $5\sqrt{3}$ cm

Step-by-step explanation:

As we can see from the figure, BCDE is a square with each corner equal to 90°.

So that, BDE is a right triangle with corner BED equal to 90°

As BDE is a right triangle, according to Pythagoras theorem, we have:

$BD^{2} = BE^{2} +ED^{2} = 5^{2} + 5^{2} = 25 + 25 = 50$ cm

As the diagram s the cube, so that it can be seen that AD is perpendicular to the surface BCDE

=> AD is perpendicular to BD

=> ADB is the right triangle with corner ADB equal to 90°.

As ADB is the right triangle, ccording to Pythagoras theorem, we have:

$AB^{2} =AD^{2} + BD^{2} = 5^{2} +50 = 25 +50 = 75$ cm

=> $AB = \sqrt{75} = 5\sqrt{3}$ cm

Conclusion: AB = $5\sqrt{3}$ cm

4 0

3 years ago

Multiply the polynomial (x-5)(x^2+4x-2)

madreJ [45]

Answer:

x^3-x^2-22x+10

Step-by-step explanation:

7 0

3 years ago

Select all the correct answers.

igor_vitrenko [27]

The two businesses Ashton could opt for are a beauty salon and a tutoring center.

<h3>What is service?</h3>

In business, a service differs from a product because a service is not a physical good but it represents help provided to customers through the work of employees.

<h3>What two businesses are based on services?</h3>

From the options the only two businesses that are based on service are:

The beauty salon: It helps customers with their hair, nails, make-up, etc.
The tutoring center: It helps customers learn new things.

Therefore, the two businesses Ashton should choose are a beauty salon and a tutoring center.

Learn more about services in: brainly.com/question/14664299

8 0

2 years ago

Plz help with any problems you can, show work for number 29

alexgriva [62]

Answer:

For number 13, I think it is rational, integer, and whole number

5 0

3 years ago

PLEASE HELP ME I NEED HELP PLEASE ASAP BRAINLIEST AND 50POINTS