write short note on mean and variance discrete variable
Answers
Answer:when dealing with finite populations, you can calculate the population mean or variance just like you do for a sample of that population. Namely, by taking into account all members of the population, not just a selected subset. For instance, to calculate the mean of the population, you would sum the values of every member and divide by the total number of members.
But what if we’re dealing with a random variable which can continuously produce outcomes (like flipping a coin or rolling a die)? In this case we would have an infinite population and a sample would be any finite number of produced outcomes.
So, you can think of the population of outcomes of a random variable as an infinite sequence of outcomes produced according to its probability distribution. But how do we calculate the mean or the variance of an infinite sequence of outcomes?