Find the expected value and the standard deviation for the discrete random variable:
y | -2 | -1 | 0 | 1 | 2 |
---|---|---|---|---|---|
Pr(Y = y) | 0.31 | 0.18 | 0.17 | 0.26 | …… |
Your answers can be rounded to four decimal digit accuracy when
entered.
E(Y) = | SD(Y) = |
Find the expected value and the standard deviation for the discrete random variable: y -2 -1...
A random variable X has an expected value of 10 with a standard deviation of 5. Let Y= 5 -2*X be another random variable. Find the expected value of Y and its standard deviation
Question 13 (1 mark) Attempt 6 The calibration of a scale is to be checked by weighing a 30kg test specimen. A random sample of 16 measurements yielded a sample standard deviation of 0.19 kg and sample mean 29.91 kg Assuming the central limit theorem applies and s o, find the p-value associated with the following hypothesis test. Ho H 30 versus Ha: u 30 Your answer can be rounded to four decimal digit accuracy when entered. p-value-
Question 13...
Find the expected value, μ, and standard deviation, σ, for a binomial random variable with each of the following values of n and p. (Round all answers for σ to four decimal places.) (a) n = 50, p = 1/2. μ = σ = (b) n = 300, p = 1/4. μ = σ = (c) n = 1000, p = 1/5. μ = σ = (d) n = 1, p = 0.3. μ = σ = (e) n =...
The desired percentage of Silicon Dioxide (SiO2) in a certain type of aluminous cement is 5.3. Historically the percentage of Sio2 in the cement is normally distributed with a standard deviation of 0.32. To monitor this process, periodically an engineer takes a random sample of 9 measurements. A recent sample yielded a sample mean of 5.481 Find the p-value associated with the following hypothesis test. Ho:H 5.3 versus Ha: 5.3 Your answer can be rounded to four decimal digit accuracy...
If X is a random variable with mean -3 and standard deviation 2, Y is a random variable with mean 5 and standard deviation 3, and the correlation between X and Y is ρ Corr(X, Y) = .8, find Cov(2x-Y, X + 5Y).
If X is a random variable with mean -3 and standard deviation 2, Y is a random variable with mean 5 and standard deviation 3, and the correlation between X and Y is ρ Corr(X, Y) =...
Calculate the expected value, the variance, and the standard deviation of the given random variable X. (Round all answers to two decimal places.) Forty-one darts are thrown at a dartboard. The probability of hitting a bull's-eye is .2. Let X be the number of bull's-eyes hit. expected value variance standard deviation
Given independent random variables, X and Y, with means and standard deviations as shown, find the mean and standard deviation of each of the variables in parts a to d. a) Xminus10 b) 0.5Y c) XplusY d) XminusY Mean SD X 60 13 Y 25 5 a) Find the mean and standard deviation for the random variable Xminus10. E(Xminus10)equals nothing SD(Xminus10)equals nothing (Type integers or decimals rounded to two decimal places as needed.)
Question 10 2 pts The probabilities of the discrete random variable X are taking values shown in the table: X 2 4 6 8 10 PIX=x) 0.18 0.31 0.34 0.10 0.07 What is the standard deviation of the distribution? (Round your answer to the third decimal place) O 2.214 0.200 6.000 O 0.121 Not enough information to answer the question O 10.000 None of the given numerical values is correct 03.162
udent Center Navigate FIU At 5 The probabilities of the discrete random variable X are taking values shown in the table: 6 8 10 4 2 2 Х PIX-x) 0.34 0.10 0.07 0.18 0.31 What is the standard deviation of the distribution? (Round your answer to the third decimal place) . None of the given numerical values is correct 0.121 6.000 Not enough information to answer the question ОО 10.000 2.214 0.200 3.162
5. A discrete random variable, X, has three possible results with the following probabilities: Pr [X 2 /3 No other results can occur. (a) Sketch a graph of the probability function (b) What is the mean or expected value of this random variable? (c) What are the variance and standard deviation of this random variable?