x1, x2, ....., xn. If , then the standard deviation of this data is:
All the students of a class performed poorly in Mathematics. The teacher decided to give grace marks of 10 to each of the students. Which of the following statistical measures will not change even after the grace marks were given?
If X is a discrete random variable which assumes values x1, x2, x3,------, xn and E(X) and Var(X) be the expectation and variance of X. If E(X) = 2 and Var(X) = 5, then