条件概率也有公式 P=(A/B)=P(A交B)/P(B)是什么意思? 21.expected value of a discrete random variable X(离散随机变量的预期值):E(X)=u=求和符号xP(X=x)2.Binomial distribution Mean(二项分布平均值)3.Standardized normal variable(标准化变量)4.条件概率和独立事件5.population parameter 和sample ...
1.expected value of a discrete random variable X(离散随机变量的预期值):E(X)=u=求和符号xP(X=x) 2.Binomial distribution Mean(二项分布平均值) 3.Standardized normal variable(标准化变量) 4.条件概率和独立事件 5.population parameter 和sample statistics有什么区别?
ofaDiscreteRandom Variable Ameasureofthe“middle” ofthevaluesofarandom variable -4-2024681012 Profit Probability Lousy OK Good Great .05 .10 .15 .40 .20 .25 .30 .35 Center Themeanoftheprobabilitydistributionis theexpectedvalueofX,denotedE(X) E(X)isalsodenotedbytheGreekletterµ (mu) k=th...
The expected value of a discrete random variable is the product of the probability and the number of trials. Therefore, if the probability of an event happening is p and the number of trials is n, the expected value will be n*p. Is the expected value the same as the expected ...
Expected value of a discrete random variable When is adiscrete random variablehavingsupport andprobability mass function , the formula for computing its expected value is a straightforward implementation of the informal definition given above: the expected value of ...
Let's calculate the mean of a discrete random variable:Below is the probability distribution for a golfer on a par 3 hole, where x = Number of Strokes to Complete CourseFigure 1. The mean can be calculated by multiplying each "x" by each "P(x)", then adding the resulting values ...
Expected Value CalculatorThis expected value calculator helps you to quickly and easily calculate the expected value (or mean) of a discrete random variable X. Enter all known values of X and P(X) into the form below and click the "Calculate" button to calculate the expected value of X. ...
The expected value, denotedE[X], of a discrete random variableX, with a finite number possible outcomes{x1,x2,…,xk}is given by the formula E[X]=∑i=1kxipi wherepiis the probability of outcomexi. The summation symbol∑is used to express the sum of a series of numbers. This formula...
Definition of expected value & calculating by hand and in Excel. Step by step. Includes video. Find an expected value for a discrete random variable.
UPDATE 2: @hxd1011 asked whether there's aphysical meaning to thatreferring to his Example 2 with the possible outcome to be animals. Right, theexpected valueis of the values of a random variable. The random variables in statistics are defined as some - usually real - values that are link...