Advertisements
Advertisements
प्रश्न
What do you understand by Mathematical expectation?
Advertisements
उत्तर
The expected value of a random variable gives a measure of the center of the distribution of the variable.
In other words,
E(X) is the long-term average value of the variable.
The expected value is calculated as a weighted average of the values of a random variable in a particular experiment.
The weights are the probabilities.
The mean of the random variable X is µX = E(X).
APPEARS IN
संबंधित प्रश्न
Two balls are drawn in succession without replacement from an urn containing four red balls and three black balls. Let X be the possible outcomes drawing red balls. Find the probability mass function and mean for X
A lottery with 600 tickets gives one prize of ₹ 200, four prizes of ₹ 100, and six prizes of ₹ 50. If the ticket costs is ₹ 2, find the expected winning amount of a ticket
Find the expected value for the random variable of an unbiased die
In a business venture a man can make a profit of ₹ 2,000 with a probability of 0.4 or have a loss of ₹ 1,000 with a probability of 0.6. What is his expected, variance and standard deviation of profit?
Let X be a random variable and Y = 2X + 1. What is the variance of Y if variance of X is 5?
Choose the correct alternative:
Probability which explains x is equal to or less than a particular value is classified as
Choose the correct alternative:
If X is a discrete random variable and p(x) is the probability of X, then the expected value of this random variable is equal to
Choose the correct alternative:
E[X – E(X)]2 is
Choose the correct alternative:
If p(x) = `1/10`, x = 10, then E(X) is
Prove that V(X + b) = V(X)
