Question

The following table provides a probability distribution for the random variable .

 

y f(y)
2 0.20
5 0.20
6 0.40
9 0.20

 

a.  Compute E (Y) (to 1 decimal)._______

 

b.  Compute Var (Y) and  σ (to 2 decimals).

Var (y) ________

σ _________

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

Related Statistics Q&A

Find answers to questions asked by students like you.

Q: COlege studeniS were given either four quarters or a $1 bill and they could either keep the money or...

A: The provided data is,

Q: Suppose you are told that a computer programmer in Portugal who makes $809.40 has a z-score of -0.50...

A: Solution: It is given that a computer programmer in Portugal who makes $809.40 has a z-score of -0.5...

Q: On a particular night, a baseball stadium sells 60% of its seats, and of those, 15% do not end up sh...

A: Let us assume there are 100x seat, where x>0 The total booked seat is 60x. According to the given...

Q: The following table was presented in an article summarizing a study to compare a new drug to a stand...

A: Decision Rule:   If p-value ≤ α, then reject the null hypothesis. If p-value > α, then do not rej...

Q: Homework: Chapter 9 Homework Save Score: 0 of 1 pt 17 of 28 (12 complete) v HW Score: 24.21%, 6.78 o...

A: Click to see the answer

Q: ae Mar 10 1 100% bcms4237-bentleyhs- C + es - HS: Statistics (Prescriptive) - 06:Pretest Electronic ...

A: Let X be the annual precipitation amounts (in inches) in a certain mountain range. It is given that ...

Q: A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the yea...

A: Standard deviation: The standard deviation is base d on how much each observation deviates from a ce...

Q: The following percentages of chloride were found: 32.52%, 32.14%, 32.61%, and 32.75%? a. find the ...

A: Given that,       32.52%, 32.14%, 32.61% and 32.75

Q: Can I have the answer to 8?

A: It is given that mean is 250 and standard deviation is 5. z-score of 245:

Q: A small pilot study is conducted to investigate the effect of a nutritional supplement on total body...

A: Hypotheses and level of significance: Denote μ1 and μ2 as the mean body weight before and after the ...

Q: Consider a population proportion p = 0.52.a-1. Calculate the expected value and the standard error o...

A: Since you have asked multiple questions, we will solve the first question for you. If you want any s...

Q: 4.) Let ?¯ be the mean of a random sample of size 50 drawn from a population with mean 112 and stand...

A: 1. The expectation and standard deviation of the sampling distribution of the sample mean are as fol...

Q: Here are the projected numbers (in thousands) of earned degrees in a certain country during one acad...

A: Click to see the answer

Q: courses/59956/assignments/1876180?module_item_id%3D7759339 dules > Week 2 Assignment: Quartiles and ...

A: Click to see the answer

Q: ALL PARTS A,B,C Over the past 5 years, U.S. airlines average about 1 fatality per month (U.S. Depart...

A: The Poisson distribution: A discrete random variable X is said to have a Poisson distribution with p...

Q: A _______ correlation is also known as a _______ correlation. Group of answer choices negative; dir...

A: From the given question, Correlation coefficient: Correlation coefficient is the measure of linear r...

Q: Salaries for teachers in a particular elementary school district are normally distributed with a mea...

A: Consider X be a random variable which follows normal distribution indicates the teacher’s salary. Th...

Q: What is the probability that a man dies between the ages of 60 and 89 ?Round your answer to four dec...

A: Introduction: The given data represents the probability distribution of number of US men born alive ...

Q: Select the most appropriate response. A company maintains a fleet of vehicles that consist of both c...

A: The coefficient of variation (CV) is a measure of relative variability. It is the ration of the stan...

Q: I asked this question and got this answer but I am still confused. Can you tell me exactly how you t...

A: Points on sampling distribution of the sample mean: If the true population distribution of a random...

Q: A test consists of 10 true/false questions. to pass the test a student must answer at least 6 questi...

A: In this context, X has a Binomial distribution with parameters n = 10 and p = 0.5. Since X is a disc...

Q: Find the indicated probability. In general, after a group makes a reservation at a restaurant, they ...

A: Click to see the answer

Q: Sm/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-lvTtV_fZtSyVRXF19F OAHM6Rx2f6TnS_nmDh8EE2EBBrWv5qM7FjooZz9...

A: Standard normal distribution: The standard normal distribution is a special case of the normal distr...

Q: Cigarette Consumption Data: A national insurance organization wanted to study the consumption patter...

A: "Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for y...

Q: Score: 0 of 1 pt 11 of 28 (12 complete) Instructor-created question Course Note Packet Chapter 9 Pag...

A: Click to see the answer

Q: Researchers studying the number of electric fish species living in various parts of the Amazon basin...

A: From the provided information, The difference between data values can be obtained as: The mean of t...

Q: The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's R...

A: Here, X denotes the number of houses sold. The mean of X is shown below:

Q: Police response time to an emergency call is the difference between the time the call is first recei...

A: Click to see the answer

Q: A sample of college students was asked how much they spent monthly on coffeecoffee. Approximate the ...

A: The following table shows the calculation of mean cost spent on coffee,

Q: A ball is drawn randomly from a jar that contains 3 red balls, 3 white balls, and 7 yellow balls. Fi...

A: Given: The jar contains 3 red balls, 3 white balls, and 7 yellow balls. The probability of a favorab...

Q: A small pilot study is run to compare a new drug for chronic pain to one that is currently available...

A: The hypothesis are, H0: The median pain level is same for the two groups. HA: The median pain level ...

Q: What is the appropriate statistical test to assess whether there is an association between obesity s...

A: A Chi-Square test can be used in order to test the significance of relationship between the two vari...

Q: A manufacturer of sprinkler systems used for fire protection in office buildings claims that thetrue...

A: Click to see the answer

Q: A venture capitalist, willing to invest $1,000,000, has three investments to choose from. The first ...

A: Click to see the answer

Q: True or False? If a 95% confidence interval for the difference in two independent means is (2.1 to 4...

A: A confidence interval including 0 means the difference is not significant.

Q: A newspaper provided a​ "snapshot" illustrating poll results from 1910 professionals who interview j...

A: Here point estimate = 26% and margin of error is ± 3 percentage points To calculate the confidence i...

Q: A stationary store has decided to accept a large shipment of ball-point pens if an inspection of 19 ...

A: Click to see the answer

Q: Given the following frequency table of data, what is the potential outlier? Value Frequency 8 1...

A: Construct a scatter plot.   Steps to construct scatter plot:   Select the data value and Frequency....

Q: On Monday mornings, the First National Bank only has one teller window open for deposits and withdra...

A: Hey, since there are multiple subparts posted, we will answer first three subparts. If you want any ...

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average ...

A: Click to see the answer

Q: The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and ...

A: The confidence level is 95%. The level of significance is 1 – confidence level = 1 – 0.95 = 0.05. Th...

Q: We would like to know: "What percentage of college students drink alcohol every day?" In a random sa...

A: Given that, N=500 X=75

Q: A successful basketball player has a height of 6 feet 4​inches, or 193cm. Based on statistics from a...

A: The z-score identify that the value how many standard deviations from the mean. If the z-score is po...

Q: Use the graphical display to answer the question. The following box-plot contains the cholesterol le...

A: Here, First Quartile = 180, Third Quartile = 211, Median = 197.5 and Maximum =265. 25% of patients l...

Q: Identify the score corresponding to the indicated percentile. The length of human pregnancies (with ...

A: Click to see the answer

Q: Score: 0 of 1 pt 12 of 28 (12 complete) Instructor-created question Course Note Packet Chapter 9 Pag...

A: Click to see the answer

Q: Find the indicated probability. In general, after a group makes a reservation at a restaurant, they ...

A: Binomial distribution: The binomial distribution gives the probability of number of successes out of...

Q: True or False Q: A researcher decides to take a random sample of the population and determine the AL...

A: 8) Bar chart is preferred for discrete data. Here, the ALT levels is a continuous data. Representing...

Q: A marketing representative wants to estimate the proportion of people in a state who like the new de...

A: Conditions for constructing a confidence interval for the population proportion are   Samples shoul...

Q: What is the main difference between dependent and independent t-tests? Write your own hypothetical e...

A: Independent samples: These samples are occur in two scenarios. Testing the difference of the means ...