onclusion For a system with n possible states and their associated probabilities p,,..., P, the average a priori uncertainty about the state of the system is Hs(p,,R The average amount of information about the system obtained after observation in ideal case is numerically equal to the uncertainty it removedConclusion For a system with N possible states and their associated probabilities p , …, p , the average a priori uncertainty about the state of the system is H (p , …, p ). 1 N S 1 N The average amount of information about the system obtained after observation in ideal case is numerically equal to the uncertainty it removed