What's the answer? It's not a fraction.
$What's the answer? It's not a fraction. - 1$

Answers

Answer 1

Answer: it would be 10 I'm sure

Answer 2

Answer: 3/2x = 15
x = 15 *2/3
x = 30/3
x =10

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A researcher wants to know how professional athletes in her city feel about safety measures. She obtains a list of 952 professional athletes in her city, selects 400 of them at random, and emails a questionnaire to them. 86 questionnaires are returned. Of these, 76% stated that they believe that the enforcement of safety measures needs to be completely overhauled. Classify the following groups as the population or the sample for this particular study. a. The proportion of all professional athickes in the rescarcher's home city who believe thal the cnlorcement of salfcty mcasures nocds to be compleicly overhauled.
b. The 76% who stated that thc enforcement of salty mcasures needs to be completh overhauled.
c. The 952 prolessional athkics whosc names were oblainoed,
d. All professional athlctes.

Answers

Answer:

Step-by-step explanation:

For this case the population represent all the professional athletes in the researcher city and we can assume that the sample size for tis population is N =982 and represent all the individuals of interest for the study and the parameter of interest is the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled .

In order to estimate te parameters of the population the researcher select a sample of 400 professional athletes and just 86 of them returns the questionnaire sent. So then the real sample is the n =86 people who return the info, because the other people are part of the non response rate, and from this sample she found that the proportion of athletes who believe that the enforcement of safety measures needs to be completely overhauled is .

p=0.76

Select all points that are on the line through 0,5and 2,8.

4,11
5,10
6,14
30,50
40,60

Answers

Answer:

Options (1), (3), and (4)

Step-by-step explanation:

Since, slope of a line passing through two points $(x_1,y_1)$ and $(x_2,y_2)$ is given by,

m = $(y_2-y_1)/(x_2-x_1)$

Therefore, slope of a line passing through (0, 5) and (2, 8) will be,

m = $(8-5)/(2-0)$ = 1.5

Equation of line passing through (x', y') and slope 'm' is,

y - y' = m(x - x')

Therefore, equation of a line passing through (0, 5) and slope = 1.5,

y - 5 = 1.5(x - 0)

y = 1.5x + 5

Since, all the points which lie on this line will satisfy this equation.

For (4, 11),

11 = 1.5(4) + 5

11 = 11

Point (4, 11) lies on this line.

Point (5, 10)

10 = 1.5(5) + 5

10 = 7.5 + 5

10 = 12.5

But 10 ≠ 12.5

Therefore, (5, 10) doesn't line on the line.

Point (6, 14)

14 = 1.5(6) + 5

14 = 14

True.

Therefore, (6, 14) lies on the line.

Point (30, 50)

50 = 1.5(30) + 5

50 = 50

True.

Therefore, (30, 50) lies on the line.

Point (40, 60)

60 = 1.5(40) + 5

60 = 65

But 60 ≠ 65

Therefore, (40, 60) doesn't lie on the line.

Options (1), (3) and (4) and the correct options.

Answer:

1, 3 and 4. I had the same question on my assignment :)

Step-by-step explanation:

A practice law exam has 100 questions, each with 5 possible choices. A student took the exam and received 13 out of 100.If the student guesses the whole test, the expected number of correct answers is 20 with a standard error of .Compute the z-test statistic for the observed value 13.Find the observed significance level or P-value of the statistic.

Answers

Answer:

$z=(13-20)/(4)=-1.75$

Assuming:

H0: $\mu \geq 20$

H1: $\mu <20$

$p_v = P(Z<-1.75) = 0.0401$

Step-by-step explanation:

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Let X the random variable of interest (number of correct answers in the test), on this case we now that:

$X \sim Binom(n=100, p=0.2)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^(n-x)$

Where (nCx) means combinatory and it's given by this formula:

$nCx=(n!)/((n-x)! x!)$

We need to check the conditions in order to use the normal approximation.

$np=100*0.2=20 \geq 10$

$n(1-p)=20*(1-0.2)=16 \geq 10$

So we see that we satisfy the conditions and then we can apply the approximation.

If we appply the approximation the new mean and standard deviation are:

$E(X)=np=100*0.2=20$

$\sigma=√(np(1-p))=√(100*0.2(1-0.2))=4$

So we can approximate the random variable X like this:

$X\sim N(\mu =20, \sigma=4)$

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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean". The letter $\phi(b)$ is used to denote the cumulative area for a b quantile on the normal standard distribution, or in other words: $\phi(b)=P(z<b)$

The z score is given by this formula:

$z=(x-\mu)/(\sigma)$

If we replace we got:

$z=(13-20)/(4)=-1.75$

Let's assume that we conduct the following test:

H0: $\mu \geq 20$

H1: $\mu <20$

We want to check is the score for the student is significantly less than the expected value using random guessing.

So on this case since we have the statistic we can calculate the p value on this way:

$p_v = P(Z<-1.75) = 0.0401$

A computer processes jobs on a first-come, first served basis in a time-sharing environment. The jobs have Poisson arrival rates average 0.6 jobs per minute. The objective in processing these jobs is that they spend no more than 5 minutes, on average, in the system. Assuming exponential service times, how fast does the computer have to process jobs (in minutes), on average, to meet this objective

Answers

Answer:

0.8 minutes

Step-by-step explanation:

From the given information:

The arrival time for the jobs to the computer obeys a Poisson distribution;

Thus, the arrival rate is:

$\lambda = 0.6 \ jobs \ per \ minute$

Assuming the average time spent on the jobs in the system is denoted by:

$W_s= 5 \ minutes$

The average time a job process in the system can be expressed as follows:

$W_s = (1)/(\mu - \lambda)$

From above formula:

$\mu =$ service rate

$\lambda =$ arrival rate

replacing the values;

$5 = (1)/(\mu - 0.6)$

$5(\mu - 0.6) = 1$

Open brackets

$5 \mu - 3 = 1$

$5 \mu = 3+ 1 \n \n \mu = (4)/(5)$

$\mu =$ 0.8 minutes

The Ortiz family will travel from Indianapolis to Denver this summer. The driving distance between the two cities is 1,058 miles. They need to find out about how much the gas will cost round trip. Their car gets about 20 miles per gallon. A. Write and solve an algrebraic equation to find out how many gallons of gas they will use. Explain your steps. B. Write and solve an algebraic equation to find out how many miles they will travel.

Answers

We get the following outcomes

(I) Relation between distance,mileage, and Amount of fuel spent is D=MN

(II) Amount of gas spent to travel 1058 miles = 52.29 gallons

It is given that

Distance D between two cities = 1058 miles

Mileage M of the car = 20 miles per gallon

as we know that

distance traveled D = mileage M* Number of gallons N

D=MN

what is the mileage?

Mileage is the number of miles traveled or covered.

So, the amount of gas spent to travel 1058 miles:

D/M = 1058/20 =52.29 gallons.

Hence,(I) relation between distance,mileage, and amount of fuel spent is D=MN.

(II) Amount of gas spent to travel 1058 miles = 52.29 gallons

to get more about mileage visit to:

brainly.com/question/96539

A. Write and solve an algrebraic equation to find out how many gallons of gas they will use. Explain your steps.

let x = gallons of gas they will use
y = distance traveled

x = y/20
x = 1058/20 = 52.9 gallons of gas

B. Write and solve an algebraic equation to find out how many miles they will travel.

let x = distance traveled
y = gallons of gas used

x = 20y
x = 20(52.9)
x = 1058 miles

Hope this helps. Have a nice day.

A small theater had 9 rows of 25 chairs each. An extra 6 chairs have just been brought in. How many chairs are in the theater now?

Answers

231 chairs because 9 times 25 is 225, plus 6 is 231

4*25=100 4*25=100 add 6 =206+25= 231

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Please help!!! Will mark brainliest!!!!!!!! Dan wants to determine the probability that the republican on the ballot will be elected mayor of his town. He surveys a random sample of 25 people in the town who are registered to vote. Based on this data, the republican on the ballot has a 36% probability of being elected. Dan now wants to gauge the variation in predictions, to determine how accurate this probability may be. Which if the following would be the best method for him to do this?A) Ask the same 25 people he originally surveyed to make sure they are convinced of their choicesB) Survey several more random samples of 25 people each from people in the town who are registered to vote C) Survey serveral more random samples of 25 people each from the Republican voters in townD) Survey a random sample of 25 people who are registered to vote in another town

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