SOCSCI 2J03 Lecture 16: SOCSCI 2J03 Lecture 16 – Mean and standard deviation of discrete random variables
12 Feb 2019
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SOCSCI 2J03 Lecture 16: SOCSCI 2J03 Lecture 16 – Mean and standard deviation of discrete random variables
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Document Summary
Socsci 2j03 lecture 16 mean and standard deviation of discrete random variables. Mean of discrete variable: x is the value that is expected to occur per repetition, on average, if an experiment is repeated a large number of times. It can also be written as e(x) = 1. 80: therefore, on average, this machine is expected to break down 1. 80 times per week over a period (mann, 2016) of time. Standard deviation of discrete random variable: x measures the spread of its probability distribution and is computed as: The following table gives the probability distribution of x: calculate standard deviation of x, add xp(x) values all together and exp(x) value is the mean: (mann, 2016) s. 250 will have no hits in 10 trips to the plate. When to apply binomial : an experiment that satisfies the following four conditions is called a binomial experiment, 4 conditions, there are n identical trials.
