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4 years ago

EXPERTS/ACE ONLY!! Ill mark as brainlist!!

Mathematics

2 answers:

34kurt4 years ago

8 0

X=2 y=4 is the correct answer

Naily [24]4 years ago

8 0

I agree with waytuunke im srry if i spelled his name wrong

You might be interested in

Please help me....asap

Solnce55 [7]

Answer:

D. No, he chose members that were not part of the population

Step-by-step explanation:

A random sample is a sampling technique in which each sample has an equal chance of being chosen. For example, blindly selecting five names from a hat filled with named sheets of paper is a random sample.

Daniel's sample is not random because each sample did not have an equal probability of being chosen. All names he does not recognize are immediately eliminated from being chosen. With this, we can eliminate choices A and B.

Daniel did not chose names from the town he was collecting data for. He chose ones from his own neighborhood. It wasn't in the population he was focusing on.

Therefore, the best answer is D.

hope this helps :)

4 0

2 years ago

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

A medical devices company wants to know the number of hours its MRI machines are used per day. A previous study found a standard

4vir4ik [10]

The company has to study 199 machines.

In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean of the set, while a high standard deviation indicates that the values are spread out over a wider range.

It is given that;

Margin of error E = 0.7

Confidence interval 98% = 1-0.98 = 0.02

Standard deviation = 6 hours

Number of MRI machines needed per day n, = [(z alpha/2 * SD)/E]²

Z alpha/2 = 1.645 at alpha = 0.1

Inputting these values into n we have that

[(1.645*6)/0.7]²

= 14.1²

= 198.81 is approximately equal to 199

The company has to study 199 machines.

To know more about standard deviation visit: brainly.com/question/475676

8 0

2 years ago

Michonne's Phone service charges $18.09 for an activation fee plus $2 for every gigabyte(g) used. Which of the following graphs

ExtremeBDS [4]

Given

Michonne's Phone service charges $18.09 for an activation fee plus $2 for every gigabyte(g) used

Show the graph model for the above sitution.

To proof

As given in the question

Michonne's Phone service charges = $18.09

activation fee plus for every gigabyte(g) used = $2

let the gigabyte used be = x

let the total charges of phone = y

Than the equation become in the form

18.09 + 2x =y

the graph is shown as below.

Hence proved

5 0

4 years ago

Please answer this question I'm giving 12 points worth of this question. The question is " A box contains 40 marbles that are re

nirvana33 [79]

There is 14 green marbles because

2/5 = 16 blue marbles

1/4 = 10 red marbles so 16+10= 26 & 40-26=14

8 0

4 years ago