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er of possible outcomes. In a random experiment, any particular set  of outcomes is called an event, and every event E has a probability, denoted by  P(E), 0 where If each outcome of an experiment is equally likely, then ≤ P(E) ≤ 1.  the probability of an event E is defifined as the following ratio:  the number of outcomes in the event E P(E) = the number of possible outcomes in the experiment  ! If E and F are two events in an experiment, then “E and F ” is an event, which is  the set of outcomes that are in the intersection of events E and F. Another event is  “E or F, ” which is the set of outcomes that are in the union of events E and F.  ! If E and F are two events and E and F are mutually exclusive, then P(E and F) = 0.  ! If E and F are two events such that the occurrence of either event does not affect  the occurrence of the other, then E and F are said to be independent events. Events  E and F are independent if and only if P(E and F) = P(E)P(F).  ! A random variable is a variable that represents values resulting from a random  experiment. The values of the random variable may be the actual outcomes of the  experiment if the outcomes are numerical, or the random variable may be related  to the outcomes more indirectly. In either case, random variables can be used to  describe events in terms of numbers.  ! A random variable from an experiment with only a fifinite number of possible  outcomes also has only a fifinite number of values and is called a discrete random  variable. When the values of a random variable form a continuous interval of real  numbers, such as all of the numbers between 0 and 2, the random variable is  called a continuous random variable.  ! Every value of a discrete random variable X, say has a probability denoted X = a,  by A histogram (or a table) showing all of the values of P(a). X and their  probabilities is called the P(X) probability distribution of X. The mean of the  random variable X is the sum of the products for a

Anderson老师
             
{教授课程}: 英联邦雅思及北美留学托福，SAT, GRE, GMAT, SSAT培训，
{教师简介}:老师自己IELTS（8分，单科不低于7.5分）GRE（330+分）GMAT（750+分）
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现招生去英联邦留学的雅思考生，和北美留学的托福，SAT, GRE, GMAT, SSAT的考生培训，就老师自己带过的学生当中像语言类考试雅思或者托福或者SSAT的高分考生的真实案例非常多，而难度比较大的思维类考试SAT，GRE，GMAT考试当中，真实案例有SAT1500+， GRE325+，GMAT700+的考生。
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