Find the mean, variance and standard deviation for the random variable X: Random Variable X -2...

Question

Question

Find the mean, variance and standard deviation for the random variable X:

Random Variable X	-2	1	3
P(X = x)	0.1	0.3	.6

Show the calculations that you need for each part. You will get no credit for using your calculator or Excel and only giving the answer.

You should write out: mean = ........ (show how the mean is calculated)

Vairance = ..............

Standard Deviation = ................

Answer 1

Answer #1

Answer 2

Similar Homework Help Questions

The random variable X has the probability distribution table shown below. Calculate the standard deviation of...

The random variable X has the probability distribution table shown below. Calculate the standard deviation of X. Show all work as to how you performed your calculations as if you did not have a calculator. (Rounded to two decimal place [6 points) [Hint: First, find E(X)] * 0136 P(X = x) 0.1 0.2 0.3 0.4
What is the mean, variance, and standard deviation of the random variable x associated with the...

What is the mean, variance, and standard deviation of the random variable x associated with the probability density function f(x)=3/14√x over the interval [1, 4].
(1 point) if X is a binomial random variable, compute the mean, the standard deviation, and...

(1 point) if X is a binomial random variable, compute the mean, the standard deviation, and the variance for each of the following cases: (a) n = 5, p = 0.1 u= O2 = 0= (b) n = 3, p = 0.5 H = O2 = o= (c) n = 3, p = 0.8 (d) n = 5, p = 0.7 u = 02 = =

If X is a random variable with mean -3 and standard deviation 2, Y is a random variable with mean...

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) =...
Find the standard deviation of the random variable X. (Round the final answer to the...

Find the standard deviation of the random variable X. (Round the final answer to the nearest tenth as needed. Round all intermediate values to the nearest thousandth as needed.) X 46 15 38 44 P(X=x) 0.4 0.3 0.2 0.1
4. Standard deviation and risk. The standard deviation o(X) of a random variable is the square...

4. Standard deviation and risk. The standard deviation o(X) of a random variable is the square root of the variance that is o(X) = Var(X). It characterizes the "spread" of the random variable X. If a random variable X has expected value p and standard deviation o, then X takes values which are on average at distance o from u. Imagine you have the choice to invest in two stock funds: an American fund with a rate return X and...

Find the mean and standard deviation for each binomial random variable: a. n = 52, π...

Find the mean and standard deviation for each binomial random variable: a. n = 52, π = .80 (Round your mean value to 2 decimal places and standard deviation to 4 decimal places.) Mean 41.6 Standard deviation b. n = 90, π = .60 (Round your mean value to 2 decimal places and standard deviation to 4 decimal places.) Mean 54 Standard deviation c. n = 42, π = .75 (Round your mean value to 2 decimal places and standard...
X is a normally distributed random variable with mean 72 and standard deviation 22. Use calculator...

X is a normally distributed random variable with mean 72 and standard deviation 22. Use calculator to find the probability indicated. P(78<X<127) P(60<X<90) P(X=80)
Suppose x is a normal distribution random variable with mean 10 and standard deviation 1.5. Find...

Suppose x is a normal distribution random variable with mean 10 and standard deviation 1.5. Find a value of xo such that p(x>xo)=90%. Group of answer choices 10+(-0.25)*1.5 10+1.28*1.5 10+(-1.28)*1.5 10+(-0.1)*1.5

The mean of a certain random variable, X, is 41 and the standard deviation is 1.3....

The mean of a certain random variable, X, is 41 and the standard deviation is 1.3. Find P(X>51) by using normalcdf without converting to z-scores. Find P(X>51) by converting to z-scores and then using normalcdf Compare your answers. Is it necessary or useful to convert to z-scores when using the TI calculator to find probabilities?