Question

Consider the following data:

x −4 −3 −2 −1 0
P(X=x) 0.1 0.1 0.1 0.3 0.4

 

Find the expected value E(X). Round your answer to one decimal place.

Expert Answer

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times may vary by subject and question complexity. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers.
Tagged in
Math
Statistics

Data

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: Please show TI 84 steps

A: It is given that margin of error (E) is 0.15 and the confidence level is 90%.Here,

Q: Engineers must consider the breadths of male heads when designing helmets. The company researchers h...

A: The minimum head breadth that will fit the clientele is 3.2 and it is calculated below: Let us defin...

Q: -One Sample Dichotomous Outcome- Suppose a similar study was conducted two years ago and found that ...

A: Giventhe prevalance of smoking among freshman = 27% = 0.27We assume to use 95% confidence interval t...

Q: I go to a Mexican Restaurant that serves my favorite foods.  I can choose from a topped sopapilla, t...

A: The food can choose from a topped sopapilla, two enchiladas or cheese quesadillas. The water or Peps...

Q: Find the following probabilities  a.) P(Z ≤ -1.25) b.) P(Z > 1.45)

A: a)Here probability of Z is less than or equal to –1.25 represents the area to the left of –1.25.

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may var...

A: It is given that 39 are extroverts out of 65 professional actors.

Q: Consider a binominal experiment with 2 trials and p=0.04 d. Find the probability of at least 1 succe...

A: d)From the given information, the binomial experiment with 2 trails and p=0.04 The probability mass ...

Q: The GPA of accounting students in a university is known to be normally distributed. A random sample ...

A: Introduction:The 100 (1 – α) % confidence interval for the population mean, μ, for given sample stan...

Q: A research scholar wants to know how many times per hour a certain strand of virus reproduces. The m...

A: It is givne that he mean is 12.9 and the population standard deviation is 2.2.

Q: suppose an individual was studying temperature's effect on crime rate. The researcher looked at 6 ra...

A: Solution:The sample mean is obtained below:From the given information, number of observations is 6 a...

Q: A certain flight arrives on time 82 percent of the time. Suppose 198flights are randomly selected. U...

A: It is given that 82% of the time the flight arrives on time. Therefore, probability of a selected fl...

Q: what are the appropriate numbers of participants needed for each of the folowing planned studies to ...

A: (a)The conditions for the effect size for the t test means are:If d ≤ 0.2, then the effect size is s...

Q: The lengths of a professor's classes have a continuous uniform distribution between 50.0 min and 52....

A: Solution: We are given that the lengths of a professor's classes have a continuous uniform distribut...

Q: To boost holiday sales, a jewelry store in Bismark, North Dakota is advertising the following promot...

A: a) The value of z is 1.79  and it is calculated below: Let us define the random variable X as the sn...

Q: 2.Researchers studied selenium levels in beef raised in a low selenium region of the United States. ...

A: Step-by-step procedure to obtain the symmetry using Excel software is as follows:First enter the dat...

Q: Jobs and productivity! How do banks rate? One way to answer this question is to examine annual profi...

A: Calculation of confidence interval:The mean is calculated using the Excel software. After entering t...

Q: Assume that adults have IQ scores that are normally distributed with a mean of μ=105 and a standard ...

A: It is given that IQ score of adults is normally distributed with mean 105 and standard deviation is ...

Q: Four students are randomly selected from an algebra class and asked whether they suffer from math an...

A: Introduction:On random selection, 4 students are selected into the sample.When asked whether they ha...

Q: In a survey of 909 U.S.adults with children conducted by the financial Industry Regulatory Authority...

A: The hypotheses for the test is given below.Null hypothesis:H0: p = 0.30Alternative hypothesis:H1: p ...

Q: I need help solving as much parts as possible pls

A: Note:Hey, since there are multiple sub-parts question posted, we will answer first three sub-parts a...

Q: A survey asked buyers whether color, size, or brand influenced their choice of cell phone. How many ...

A: This problem involving 3 sets : Color, Size and Brandn(Color)=5n(Size)=8n(Brand)=16n(Color and Size)...

Q: About 1% of the population has a particular genetic mutation. 400 people are randomly selected.Find ...

A: From the given information,x is the random variable that follows binomial distribution

Q: (assume that all variables are approximately normally distributed) Weights of Elephants: A sample of...

A: The formula for 95% confidence interval is given below: 

Q: Determine whether to use a permutation or combination to answer each question, and then determine th...

A: Permutation rule:There are n different items and r number of selections and the selections are made ...

Q: The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distribut...

A: Solution:a.The 28th percentile for the number of chocolate chips in a bag is obtained below:From the...

Q: When an event is an independent event, its occurrence does not affect nor is it affected by another ...

A: If the event does not depend on the other events then the event can be termed as independent event.

Q: Births are approximately uniformly distributed between the 52 weeks of the year. 1 1 s x53 f(x) 52 (...

A: Solution:Continuous uniform distribution:A random variable X is said to have the rectangular distrib...

Q: What is the minimal sample size needed for a 95% confidence interval to have a maximal margin of err...

A: Given confidence interval 95%.maximal margin of error = 0.1.The critical Z score for 95% confidence ...

Q: The physical plant at the main campus of a large state university recieves daily requests to replace...

A: Solution: We are given that the distribution of the number of daily requests is bell-shaped and has ...

Q: The​ three-year recidivism rate of parolees in a certain state is about 20​%; that​ is, 20​% of paro...

A: Solution:Binomial distribution:The binomial distribution gives the probability of number of successe...

Q: Here is a chart showing how many people are non-smokers, occasional smokers, and heavy smokers by th...

A: Note:Hey there! Thank you for the question. Since you have posted two different questions together, ...

Q: You need to select a simple random sample of three from nine friends who will participate in a surve...

A: Random number table:Here, there are 9 friends and has been assigned a number from 1 to 9. A simple r...

Q: Use the Empirical Rule. The mean speed of a sample of vehicles along a stretch of highway is 69 mile...

A: Solution:The empirical rule for any normal distribution is given below.68% of the observations fall ...

Q: Consider a bimominal experiment with 2 trials and p=0.4 d. Find the probability of at least one succ...

A: It is given that n = 2 and p = 0.4. Therefore, q = 1–p = 0.6.The PMF of binomial distribution is giv...

Q: The US population is 13% African American.  If you were to take a SRS of 500 Americans, above what p...

A: Solution:From the given information, the proportion of African American is 0.13, random sample of si...

Q: How many different three-letter words (including nonsense words) can be formed allowing repetition o...

A: From the given information, three letter words formed allowing repetition of letters.Three letter in...

Q: For a sample of 150 that has a mean of 6540 and a standard deviation =.89, calculate the 95% confide...

A: From the given dataSample size 150, mean 6540 and standard deviation 0.89

Q: In the United States, the mean age of men when they marry for the first time follows the normal dist...

A: It is given that the mean and standard deviation are 29 years and 2.5 years, respectively. The sampl...

Q: I need help with this textbook question. I cant find an example for it in my book. Thank you.

A: The sample mean is obtained below: From the given information, number of observations is 17 and conf...

Q: In 2008, the Detroit Lions set an NFL record by losing all 16 regular-season games. Suppose that the...

A: It is given that n =16.Here, probability of winning an individual game is 0.10.

Q: How many ways are there to choose first, second, and third prizes in an art contest with 18 entries?

A: Introduction:According to the permutation rule, if r distinct items are to be chosen from n items wi...

Q: A population of values has a normal distribution with μ=60.4μ=60.4 and σ=98.4σ=98.4. You intend to d...

A: It is given that the mean and standard deviations are 60.4 and 98.4Probability that the selected val...

Q: Assume that different groups of couples use a particular method of gender selection and each couple ...

A: Introduction:Consider giving birth to a girl to be a success. The probability of success is, p = 0.5...

Q: Part A, D, E, G

A: Note:Hi there! Thanks for posting the question. As your question does not contain Part G, we had ans...

Q: Possion Distribution A company produces optical-fiber cable with a mean of 0.5 flaws per 100 feet. W...

A: Here the random variable X, Number of flaws per 900 feet follows Poisson distribution with mean 0.5 ...

Q: A genetic experiment with peas resulted in one sample of offspring that consisted of 412 green peas ...

A: a) The 95% confidence interval to estimate the percentage of yellow peas is (23%, 31%) and it is cal...

Q: novel pages-  a random sample of 25 novels has a standard deviation of 9 pages. Find the 95% confide...

A: The sample standard deviation is 9.The sample size is 25.

Q: How many license plates can be made using two letters followed by four digits (0-9), allowing repeti...

A: From this given information, license plates can be made using two letters followed by four digits (0...

Q: 2. A study based on a sample size of 36 reported a mean of 87 with a margin of error of 10 for 95% c...

A: Hey there! Thank you for posting the question. Since there are multiple questions posted, we will an...

Q: Unrest and violence on one Southern campus had decreased by 62% from 10 years ago. Four out of ten A...

A: Population:The set of all subjects of interest can be termed as population.Sample:The subset of the ...